Power consumption detection circuit, tool and system

Abstract

The invention discloses a power consumption detection circuit, tool and system, and relates to the technical field of electronic product testing, and the power consumption detection circuit comprises a time delay circuit and a switching circuit. When a power supply is connected, a time delay circuit generates a time delay opening signal of which the voltage value gradually rises within a preset time and sends the time delay opening signal to a switching circuit, so that the switching circuit switches on the power supply according to the voltage value of the time delay opening signal; a connection loop between the power output end of the to-be-tested product and the positive terminal of the universal meter is controlled to gradually change from a complete cut-off state to a complete conduction state within a preset time, and in the process, the current received by the universal meter is gradually increased, so that too large instantaneous current cannot be received, and the detection accuracy is improved. The fuse in the universal meter can be protected from being damaged due to the fact that the fuse receives overlarge instantaneous current.

Description

Technical Field

[0001] The present application relates to the field of electronic product testing, and in particular to a power consumption detection circuit, tooling and system. Background Art

[0002] In the electronics industry, electronic products produced by various factories need to undergo multiple tests before they can be packaged as finished products and put on the market. For some electronic products, their output power in the working state is an important indicator. For such products, the electronic products to be tested can usually be installed on a specific test fixture, and then the test fixture is powered on for corresponding tests. The fixture is provided with an external interface for connecting a test device such as a multimeter. The external interface can be connected to the power output end of the product to be tested through a switch structure inside the test fixture. When the test fixture is powered on, the power output end of the product to be tested and the multimeter can be connected, so that the multimeter adjusted to the power measurement position can measure the output power of the current product to be tested. However, due to the too fast switching speed of the on-off state of the switch structure and the excessive voltage output by the product to be tested, when the fixture is powered on, the multimeter may receive an excessively large transient current, which can easily cause the fuse inside the multimeter to blow, resulting in inaccurate test results and frequent damage to the multimeter. Summary of the invention

[0003] The main purpose of this application is to provide a power consumption detection circuit, tooling and system, aiming to solve the technical problem of how to avoid damage to the internal fuse of the multimeter due to excessive instantaneous current generated when the electronic product is powered on when testing the output power of the electronic product through a multimeter.

[0004] To achieve the above object, the present application provides a power consumption detection circuit, the power consumption detection circuit comprising: a delay circuit and a switch circuit;

[0005] The first end of the delay circuit is used to connect to the power supply, the second end of the delay circuit is connected to the control end of the switch circuit, the third end of the delay circuit and the output end of the switch circuit are used to connect to the positive terminal of the multimeter, and the input end of the switch circuit is connected to the power output end of the product to be tested;

[0006] The delay circuit is used to generate a delayed start signal when the power supply is connected, the voltage value of which rises from the first voltage to the second voltage within a preset time, and transmit the delayed start signal to the switch circuit;

[0007] The switch circuit is used to control the on-off state of the connection loop between the input end and the output end to gradually change from a completely off state to a completely on state within the preset time according to the voltage value of the delayed start signal.

[0008] In one embodiment, the delay circuit includes: a first resistor, a second resistor and a first capacitor;

[0009] The first end of the first resistor is used to connect to the power supply, the second end of the first resistor is respectively connected to the first end of the second resistor and the first end of the first capacitor, the second end of the second resistor is connected to the control end of the switching circuit, and the second end of the first capacitor and the output end of the switching circuit are used to connect to the positive terminal of the multimeter.

[0010] In one embodiment, the delay circuit further includes: a third resistor and a first diode;

[0011] The anode of the first diode is respectively connected to the second end of the first resistor, the first end of the second resistor and the first end of the first capacitor, the cathode of the first diode, the first end of the third resistor and the first end of the first resistor are used to connect to the power supply, and the second end of the third resistor, the second end of the first capacitor and the output end of the switching circuit are used to connect to the positive terminal of the multimeter.

[0012] In one embodiment, the switch circuit includes: a fourth resistor, a first voltage stabilizing diode and an NMOS tube;

[0013] The drain of the NMOS tube is connected to the power output end of the product to be tested, the gate of the NMOS tube is respectively connected to the second end of the delay circuit, the first end of the fourth resistor and the cathode of the first voltage regulator diode, and the source of the NMOS tube, the second end of the fourth resistor, the anode of the first voltage regulator diode and the third end of the delay circuit are used to connect to the positive terminal of the multimeter.

[0014] In one embodiment, the power consumption detection circuit further includes: a voltage stabilizing circuit;

[0015] The input end of the voltage stabilizing circuit is used to connect to the power supply, and the output end of the voltage stabilizing circuit is connected to the first end of the delay circuit;

[0016] The voltage stabilizing circuit is used to stabilize the power supply signal output by the power supply, and output a corresponding stabilized power supply signal to the delay circuit;

[0017] The delay circuit is also used to generate the delayed start signal when receiving the regulated power supply signal, and transmit the delayed start signal to the switch circuit.

[0018] In one embodiment, the voltage stabilizing circuit includes: a first rectifier diode, a second rectifier diode, a second voltage stabilizing diode, a second diode, a fifth resistor, a sixth resistor, a seventh resistor, a first N-type transistor, and a second N-type transistor;

[0019] The base of the first N-type transistor is respectively connected to the second end of the fifth resistor and the anode of the second diode, the collector of the first N-type transistor is connected to the second end of the sixth resistor, and the emitter of the first N-type transistor is connected to the base of the second N-type transistor; the collector of the second N-type transistor is connected to the second end of the seventh resistor, the emitter of the second N-type transistor is connected to the anode of the second rectifier diode, and the cathode of the second rectifier diode is connected to the first end of the delay circuit; the anode of the first rectifier diode is used to connect to the power supply, and the cathode of the first rectifier diode is respectively connected to the first end of the fifth resistor, the first end of the sixth resistor and the first end of the seventh resistor; the cathode of the second voltage regulator diode is connected to the cathode of the second diode, and the anode of the second voltage regulator diode is grounded.

[0020] In one embodiment, the voltage stabilizing circuit further includes: a second capacitor;

[0021] The first end of the second capacitor is respectively connected to the cathode of the first rectifier diode, the first end of the fifth resistor, the first end of the sixth resistor and the first end of the seventh resistor, and the second end of the second capacitor is grounded.

[0022] In one embodiment, the voltage stabilizing circuit further includes: a third capacitor;

[0023] A first end of the third capacitor is respectively connected to the cathode of the second rectifier diode and the first end of the delay circuit, and a second end of the third capacitor is grounded.

[0024] In addition, to achieve the above-mentioned purpose, the present application also provides a power consumption detection tool, which adopts the power consumption detection circuit described above.

[0025] In addition, to achieve the above-mentioned purpose, the present application also provides a power consumption detection system, which adopts the power consumption detection tooling as described above.

[0026] The present application provides a power consumption detection circuit, tooling and system, wherein the power consumption detection circuit comprises: a delay circuit and a switch circuit; the first end of the delay circuit is used to connect to a power supply, the second end of the delay circuit is connected to a control end of the switch circuit, the third end of the delay circuit and the output end of the switch circuit are used to connect to a positive terminal of a multimeter, and the input end of the switch circuit is connected to a power output end of a product to be tested; the delay circuit is used to generate a delayed start signal whose voltage value rises from a first voltage to a second voltage within a preset time when the power supply is connected, and transmit the delayed start signal to the switch circuit; the switch circuit is used to control the on-off state of the connection loop between the input end and the output end to gradually change from a completely cut-off state to a fully on state within the preset time according to the voltage value of the delayed start signal. When the power supply is connected, a delayed start signal with a voltage value that gradually rises within a preset time is generated through a delay circuit and sent to the switching circuit, so that the switching circuit controls the connection loop between the power output terminal of the product to be tested and the positive terminal of the multimeter to gradually change from a completely cut-off state to a fully on state within a preset time according to the voltage value of the delayed start signal. In the above process, the current received by the multimeter gradually increases, so it will not receive excessive instantaneous current, which can protect the internal fuse of the multimeter from being damaged by receiving excessive instantaneous current. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] Figure 1 A schematic diagram of the structure of the power consumption detection circuit embodiment 1 of the present application;

[0030] Figure 2 A circuit connection diagram provided for the second embodiment of the power consumption detection circuit of the present application;

[0031] Figure 3 This is a circuit connection diagram provided for the third embodiment of the power consumption detection circuit of the present application.

[0032] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0034] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0035] This application proposes a first embodiment of a power consumption detection circuit, please refer to Figure 1 , the power consumption detection circuit includes: a delay circuit 10 and a switch circuit 20;

[0036] The first end of the delay circuit 10 is used to connect to the power supply 30, the second end of the delay circuit 10 is connected to the control end of the switch circuit 20, the third end of the delay circuit 10 and the output end of the switch circuit 20 are used to connect to the positive terminal of the multimeter 40, and the input end of the switch circuit 20 is connected to the power output end of the product to be tested 50;

[0037] The delay circuit 10 is used to generate a delayed start signal when the power supply 30 is connected, the voltage value of which rises from the first voltage to the second voltage within a preset time, and transmit the delayed start signal to the switch circuit 20;

[0038] The switch circuit 20 is used to control the on / off state of the connection loop between the input end and the output end to gradually change from a completely off state to a completely on state within the preset time according to the voltage value of the delayed start signal.

[0039] It should be understood that the power consumption detection circuit proposed in this embodiment can be specifically arranged in a tooling for testing the output power of electronic products, and the tooling can be electrically connected to the corresponding electronic product to be tested (i.e., the product to be tested 50 mentioned above), that is, electrically connected to the power output end of the product to be tested 50 mentioned above, and can receive the power output of the product to be tested 50 under the test state; the power consumption detection circuit is also provided with a power supply end and an external test end, and the power supply end can be connected to the power supply 30 of the above-mentioned tooling. When the power supply 30 is connected, the power consumption detection circuit can work normally, and the power output of the product to be tested 50 can be transmitted to the external test end. At this time, the multimeter 40 with the gear adjusted can be connected to the external test end with the positive terminal, so that the multimeter 40 can obtain the current output power of the product to be tested 50, and the power consumption generated by the product to be tested 50 under the test state can be obtained.

[0040] It should be noted that the switch circuit 20 can be regarded as a switch structure. At the moment when the control end of the switch circuit 20 is directly or indirectly connected to the power supply 30, the power supply 30 will transmit the power supply signal to the switch circuit 20 through the delay circuit 10. The switch circuit 20 can control the on-off state of the connection loop between its input end and the output end according to the voltage value of the received electrical signal. If an electrical signal far higher than the threshold voltage is received, the connection loop is in a fully on state. If an electrical signal far lower than the threshold voltage is received, the connection loop is in a fully off state. However, when the switch circuit 20 instantly receives an electrical signal higher than the threshold voltage, the connection loop instantly switches from a fully off state to a fully on state. If the voltage provided at the power output end of the product to be tested 50 connected to the input end of the switch circuit 20 is too high, the connection loop will generate a large instantaneous current at the moment of switching to the fully on state, and flow into the positive terminal of the multimeter 40. The excessive instantaneous current may cause the fuse inside the multimeter 40 to blow, and the multimeter 40 cannot normally measure the output power of the product to be tested 50.

[0041] It is easy to understand that the threshold voltage mentioned above refers to the judgment voltage for controlling the switching of the on-off state of the connection loop between the input end and the output end of the switch circuit 20. The first voltage should be less than the threshold voltage, and the second voltage should be greater than the threshold voltage. In this embodiment, a delay circuit 10 can be set between the control end of the switch circuit 20 and the power supply 30. When the delay circuit 10 is connected to the power supply 30, the voltage value of the power supply signal transmitted by the power supply 30 is processed, and a delayed start signal whose voltage value gradually changes from the first voltage to the second voltage within a preset time is obtained, and the delayed start signal is transmitted to the control end of the switch circuit 20 at the same time. Since the voltage value of the delayed start signal gradually rises from the first voltage to the second voltage within the preset time, it can be considered that the voltage at the control end of the switch circuit 20 also rises from the first voltage to the second voltage within the preset time, that is, at the moment of connecting to the power supply 30 through the delay circuit 10, the voltage value of the delayed start signal received by the switch circuit 20 within the preset time is first a first voltage lower than the threshold voltage, and then gradually increases to the threshold voltage as time goes by, and finally increases to the second voltage higher than the threshold voltage. In the above process, the on-off state of the connection loop between the input and output ends of the switch circuit 20 is first converted from a completely off state to a state between an intervening off state and an on state, and then converted to a completely on state, and the voltage output by the product to be tested 50 through the connection loop gradually increases, and does not jump in a very short time, so it does not generate excessive transient current to cause the fuse inside the connected multimeter 40 to melt. The above process can also be understood as that when the switch circuit 20 is connected to the power supply 30 through the delay circuit 10, the process of changing the on-off state of the connection loop between the input and output ends of the switch circuit 20 from a completely off state to a completely on state is extended by the delay circuit 10, so that the voltage output by the product to be tested 50 through the switch circuit 20 gradually increases smoothly, avoiding the generation of transient current, so that the multimeter 40 can be better protected from being damaged when measuring the output power of the product to be tested 50.

[0042] The present application provides a power consumption detection circuit, which includes: a delay circuit and a switch circuit; the first end of the delay circuit is used to connect to a power supply, the second end of the delay circuit is connected to the control end of the switch circuit, the third end of the delay circuit and the output end of the switch circuit are used to connect to the positive terminal of a multimeter, and the input end of the switch circuit is connected to the power output end of a product to be tested; the delay circuit is used to generate a delayed start signal whose voltage value rises from a first voltage to a second voltage within a preset time when the power supply is connected, and transmit the delayed start signal to the switch circuit; the switch circuit is used to control the on-off state of the connection loop between the input end and the output end to gradually change from a completely cut-off state to a fully on state within the preset time according to the voltage value of the delayed start signal. When the power supply is connected, a delayed start signal with a voltage value that gradually rises within a preset time is generated through a delay circuit and sent to the switching circuit, so that the switching circuit controls the connection loop between the power output terminal of the product to be tested and the positive terminal of the multimeter to gradually change from a completely cut-off state to a fully on state within a preset time according to the voltage value of the delayed start signal. In the above process, the current received by the multimeter gradually increases, so it will not receive excessive instantaneous current, which can protect the internal fuse of the multimeter from being damaged by receiving excessive instantaneous current.

[0043] Based on the first embodiment of the power consumption detection circuit of the present application, in the second embodiment of the power consumption detection circuit of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be described in detail later. Figure 2 , the delay circuit 10 includes: a first resistor R1, a second resistor R2 and a first capacitor C1;

[0044] The first end of the first resistor R1 is used to connect to the power supply 30, the second end of the first resistor R1 is respectively connected to the first end of the second resistor R2 and the first end of the first capacitor C1, the second end of the second resistor R2 is connected to the control end of the switch circuit 20, and the second end of the first capacitor C1 and the output end of the switch circuit 20 are used to connect to the positive terminal of the multimeter 40.

[0045] It should be noted that, in the present embodiment, the delay circuit 10 can be formed by a first resistor R1, a second resistor R2 and a first capacitor C1. When the delay circuit 10 is connected to the power supply 30, the electrical signal output by the power supply 30 flows to the control end of the switch circuit 20 through the first resistor R1 and the second resistor R2. When passing through the first capacitor C1 connected between the first resistor R1 and the second resistor R2, the first capacitor C1 is charged, that is, the process of generating a delayed start signal. At this time, the voltage value received by the control end of the switch circuit 20 gradually rises from the first voltage to the second voltage as the first capacitor C1 is charged. Correspondingly, the connection loop between the input end and the output end of the switch circuit 20 also follows the gradually increasing voltage value received by its control end, and gradually changes from a completely cut-off state to a fully on state within a preset time.

[0046] The first resistor R1 and the second resistor R2 can have a current limiting function to protect various components in the circuit. In addition, the specific length of the "preset time" can also be adjusted by the resistance value of the first resistor R1, the resistance value of the second resistor R2 and the capacitance value of the first capacitor C1.

[0047] Furthermore, in this embodiment, the delay circuit 10 further includes: a third resistor R3 and a first diode D1;

[0048] The anode of the first diode D1 is respectively connected to the second end of the first resistor R1, the first end of the second resistor R2 and the first end of the first capacitor C1, the cathode of the first diode D1, the first end of the third resistor R3 and the first end of the first resistor R1 are used to connect to the power supply 30, and the second end of the third resistor R3, the second end of the first capacitor C1 and the output end of the switching circuit 20 are used to connect to the positive terminal of the multimeter 40.

[0049] It should be noted that, in this embodiment, when the power supply 30 is connected, the first capacitor C1 will be charged, and when the power supply 30 is disconnected, the fully charged first capacitor C1 needs to release the stored electric energy. If it is released directly, it may cause damage to various components in the circuit. Therefore, a first diode D1 can be connected in parallel at both ends of the first resistor R1, and its anode is connected to the first end of the first capacitor C1, and a third resistor R3 is set between the cathode of the first diode D1 and the second end of the first capacitor C1. In this way, when the power supply 30 is disconnected, a loop can be formed by the first capacitor C1, the first diode D1 and the third resistor R3 to consume the electric energy released by the first capacitor C1, thereby protecting other components in the circuit.

[0050] Furthermore, in this embodiment, the switch circuit 20 includes: a fourth resistor R4, a first voltage stabilizing diode Dw1 and an NMOS transistor Qn;

[0051] The drain of the NMOS tube Qn is connected to the power output end of the product to be tested 50, the gate of the NMOS tube Qn is respectively connected to the second end of the delay circuit 10, the first end of the fourth resistor R4 and the cathode of the first voltage regulator diode Dw1, and the source of the NMOS tube Qn, the second end of the fourth resistor R4, the anode of the first voltage regulator diode Dw1 and the third end of the delay circuit 10 are used to connect to the positive terminal of the multimeter 40.

[0052] It is easy to understand that in this embodiment, the switch circuit 20 can be composed of an NMOS tube Qn, a first voltage stabilizing diode Dw1 and a fourth resistor R4, wherein the "threshold voltage" mentioned above is the voltage value that can make the NMOS tube Qn switch the on and off state, so the model of the NMOS tube Qn can be changed to adjust the threshold voltage. In a specific implementation, the first voltage stabilizing diode Dw1 is used to limit the voltage at the gate of the NMOS tube Qn. If the voltage at the gate of the NMOS tube Qn is too large, the first voltage stabilizing diode Dw1 is reversely conducted, and the voltage drop generated is the voltage value received at the gate, so that the voltage received at the gate is stabilized at a lower fixed value, thereby protecting the NMOS tube Qn. The fourth resistor R4 is used to discharge the discharge energy for the body diode or body capacitor of the NMOS tube Qn when the power supply 30 is cut off, and is also used to protect the NMOS tube Qn from being damaged.

[0053] Based on the first embodiment and / or the second embodiment of the present application, in the third embodiment of the present application, the same or similar contents as those of the above-mentioned first and second embodiments can refer to the above introduction, and will not be repeated later. Figure 3 , the power consumption detection circuit further includes: a voltage stabilizing circuit 60;

[0054] The input end of the voltage stabilizing circuit 60 is used to connect to the power supply 30, and the output end of the voltage stabilizing circuit 60 is connected to the first end of the delay circuit 10;

[0055] The voltage stabilizing circuit 60 is used to stabilize the power supply signal output by the power supply 30, and output the corresponding stabilized power supply signal to the delay circuit 10;

[0056] The delay circuit 10 is further configured to generate the delayed start signal when receiving the regulated power supply signal, and transmit the delayed start signal to the switch circuit 20 .

[0057] It should be noted that in this embodiment, since the power supply 30 is a tooling power supply, its output voltage may actually be too large. Therefore, at the moment of connecting or disconnecting the power supply 30, a large instantaneous voltage or instantaneous current may also be generated, which may easily cause damage to the components in the circuit.

[0058] It is easy to understand that in this embodiment, a voltage stabilizing circuit 60 can also be set between the delay circuit 10 and the power supply 30 to stabilize the power supply signal provided by the power supply 30, so that when the power supply 30 is connected, the delay circuit 10 will only receive the stabilized power supply signal with a stable voltage value and not higher than the second voltage transmitted by the voltage stabilizing circuit 60. At this time, the delay circuit 10 can generate a delayed start signal whose voltage value gradually changes from the first voltage to the second voltage within a preset time according to the stabilized power supply signal, and transmit it to the switch circuit 20. It can also be understood that the voltage stabilizing circuit 60 can prevent the transient current or transient voltage generated at the moment of connecting to or disconnecting the power supply 30 from damaging the delay circuit 10 and the switch circuit 20 connected at the subsequent stage.

[0059] Further, in this embodiment, the voltage stabilizing circuit 60 includes: a first rectifier diode DZ1, a second rectifier diode DZ2, a second voltage stabilizing diode Dw2, a second diode D2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first N-type transistor Vn1, and a second N-type transistor Vn2;

[0060] The base of the first N-type transistor Vn1 is respectively connected to the second end of the fifth resistor R5 and the anode of the second diode D2, the collector of the first N-type transistor Vn1 is connected to the second end of the sixth resistor R6, and the emitter of the first N-type transistor Vn1 is connected to the base of the second N-type transistor Vn2; the collector of the second N-type transistor Vn2 is connected to the second end of the seventh resistor R7, the emitter of the second N-type transistor Vn2 is connected to the anode of the second rectifier diode DZ2, and the cathode of the second rectifier diode DZ2 is connected to the first end of the delay circuit 10; the anode of the first rectifier diode DZ1 is used to connect to the power supply 30, and the cathode of the first rectifier diode DZ1 is respectively connected to the first end of the fifth resistor R5, the first end of the sixth resistor R6 and the first end of the seventh resistor R7; the cathode of the second voltage regulator diode Dw2 is connected to the cathode of the second diode D2, and the anode of the second voltage regulator diode Dw2 is grounded.

[0061] It should be noted that, in this embodiment, the first N-type transistor Vn1 and the second N-type transistor Vn2 form a cascade structure, which can be equivalent to an N-type transistor with a larger amplification gain, and is used to compensate for the current loss caused by the impedance of the previous circuit. The sixth resistor R6 is a current-limiting resistor connected to the collector of the first N-type transistor Vn1, and is used to limit the collector current of the first N-type transistor Vn1; the seventh resistor R7 is a current-limiting resistor connected to the collector of the second N-type transistor Vn2, and is used to limit the collector current of the second N-type transistor Vn2. The fifth resistor R5, the second diode D2 and the second voltage-stabilizing diode Dw2 form a voltage-dividing structure. When the voltage value of the power supply signal output by the power supply 30 is too high, the second voltage-stabilizing diode Dw2 conducts in the reverse direction, and the voltage drop value generated by it is the voltage received by the base of the first N-type transistor Vn1, so that the output current of the first N-type transistor Vn1 is stabilized at a specific value. Based on a similar principle, the output current of the second N-type transistor Vn2 is also stabilized at a specific value, so that the voltage value output by the second N-type transistor Vn2 can be stabilized at a second voltage. The first rectifier diode DZ1 is used to prevent the current from flowing back into the circuit, and the second rectifier diode DZ2 is used to prevent the current released by the first capacitor C1 in the delay circuit 10 from flowing back into the voltage-stabilizing circuit 60 when the power supply 30 is disconnected.

[0062] It is worth noting that since the first rectifier diode DZ1 and the second rectifier diode DZ2 will also generate a voltage drop when they are turned on, in order to ensure that the voltage stabilizing circuit 60 can output a stable second voltage, the voltage value output by the second N-type transistor Vn2 needs to be designed to be higher.

[0063] Furthermore, in this embodiment, the voltage stabilizing circuit 60 further includes: a second capacitor C2;

[0064] A first end of the second capacitor C2 is respectively connected to the cathode of the first rectifier diode DZ1, a first end of the fifth resistor R5, a first end of the sixth resistor R6 and a first end of the seventh resistor R7, and a second end of the second capacitor C2 is grounded.

[0065] It should be noted that, in order to ensure the normal operation of the voltage stabilizing circuit 60, a grounded second capacitor C2 can be provided after the first rectifier diode DZ1, and the second capacitor C2 is a filter capacitor, which is used to filter the power supply signal output by the power supply 30 when the power supply 30 is connected. In this embodiment, the second capacitor C2 can be a single capacitor or a combination of multiple capacitors or a device with similar functions, which is not limited here.

[0066] Furthermore, in this embodiment, the voltage stabilizing circuit 60 further includes: a third capacitor C3;

[0067] A first end of the third capacitor C3 is respectively connected to the cathode of the second rectifier diode DZ2 and the first end of the delay circuit 10 , and a second end of the third capacitor C3 is grounded.

[0068] It should be noted that, in order to ensure the normal operation of the subsequent circuit of the voltage stabilizing circuit 60, a grounded third capacitor C3 can be provided after the second rectifier diode DZ2, and the third capacitor C3 is also a filter capacitor, which is used to filter the electrical signal output to the delay circuit 10. In this embodiment, the third capacitor C3 can also be a single capacitor or a combination of multiple capacitors or a device with similar functions, which is not limited here.

[0069] An embodiment of the present application also provides a power consumption detection tool, which adopts the power consumption detection circuit described above.

[0070] The power consumption detection tool provided in the embodiment of the present application adopts the power consumption detection circuit as described above, which can solve the technical problem of how to avoid the damage of the internal fuse of the multimeter due to excessive instantaneous current generated when the electronic product is powered on when testing the output power of the electronic product through the multimeter. Compared with the prior art, the beneficial effects of the power consumption detection tool provided in the embodiment of the present application are the same as the beneficial effects of the power consumption detection circuit provided in the above embodiment, which will not be repeated here.

[0071] An embodiment of the present application also provides a power consumption detection system, which uses the power consumption detection tooling as described above.

[0072] The power consumption detection system provided in the embodiment of the present application adopts the power consumption detection tooling as described above, which can solve the technical problem of how to avoid the damage of the internal fuse of the multimeter due to excessive instantaneous current generated when the electronic product is powered on when testing the output power of the electronic product through the multimeter. Compared with the prior art, the beneficial effects of the power consumption detection system provided in the embodiment of the present application are the same as the beneficial effects of the power consumption detection tooling provided in the above embodiment, which will not be repeated here.

[0073] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent processing scope of the present application.

Claims

1. A power consumption detection circuit, characterized in that: The power consumption detection circuit comprises: a delay circuit and a switch circuit; The first end of the delay circuit is used to connect to the power supply, the second end of the delay circuit is connected to the control end of the switch circuit, the third end of the delay circuit and the output end of the switch circuit are used to connect to the positive terminal of the multimeter, and the input end of the switch circuit is connected to the power output end of the product to be tested; The delay circuit is used to generate a delayed start signal when the power supply is connected, the voltage value of which rises from the first voltage to the second voltage within a preset time, and transmit the delayed start signal to the switch circuit; The switch circuit is used to control the on-off state of the connection loop between the input end and the output end to gradually change from a completely off state to a completely on state within the preset time according to the voltage value of the delayed start signal.

2. The power consumption detection circuit according to claim 1, characterized in that: The delay circuit comprises: a first resistor, a second resistor and a first capacitor; The first end of the first resistor is used to connect to the power supply, the second end of the first resistor is respectively connected to the first end of the second resistor and the first end of the first capacitor, the second end of the second resistor is connected to the control end of the switching circuit, and the second end of the first capacitor and the output end of the switching circuit are used to connect to the positive terminal of the multimeter.

3. The power consumption detection circuit according to claim 2, characterized in that: The delay circuit further includes: a third resistor and a first diode; The anode of the first diode is respectively connected to the second end of the first resistor, the first end of the second resistor and the first end of the first capacitor, the cathode of the first diode, the first end of the third resistor and the first end of the first resistor are used to connect to the power supply, and the second end of the third resistor, the second end of the first capacitor and the output end of the switching circuit are used to connect to the positive terminal of the multimeter.

4. The power consumption detection circuit according to claim 1, characterized in that: The switch circuit comprises: a fourth resistor, a first voltage stabilizing diode and an NMOS tube; The drain of the NMOS tube is connected to the power output end of the product to be tested, the gate of the NMOS tube is respectively connected to the second end of the delay circuit, the first end of the fourth resistor and the cathode of the first voltage regulator diode, and the source of the NMOS tube, the second end of the fourth resistor, the anode of the first voltage regulator diode and the third end of the delay circuit are used to connect to the positive terminal of the multimeter.

5. The power consumption detection circuit according to claim 1, characterized in that: The power consumption detection circuit further includes: a voltage stabilizing circuit; The input end of the voltage stabilizing circuit is used to connect to the power supply, and the output end of the voltage stabilizing circuit is connected to the first end of the delay circuit; The voltage stabilizing circuit is used to stabilize the power supply signal output by the power supply, and output a corresponding stabilized power supply signal to the delay circuit; The delay circuit is also used to generate the delayed start signal when receiving the regulated power supply signal, and transmit the delayed start signal to the switch circuit.

6. The power consumption detection circuit according to claim 5, characterized in that: The voltage stabilizing circuit includes: a first rectifier diode, a second rectifier diode, a second voltage stabilizing diode, a second diode, a fifth resistor, a sixth resistor, a seventh resistor, a first N-type transistor and a second N-type transistor; The base of the first N-type transistor is respectively connected to the second end of the fifth resistor and the anode of the second diode, the collector of the first N-type transistor is connected to the second end of the sixth resistor, and the emitter of the first N-type transistor is connected to the base of the second N-type transistor; the collector of the second N-type transistor is connected to the second end of the seventh resistor, the emitter of the second N-type transistor is connected to the anode of the second rectifier diode, and the cathode of the second rectifier diode is connected to the first end of the delay circuit; the anode of the first rectifier diode is used to connect to the power supply, and the cathode of the first rectifier diode is respectively connected to the first end of the fifth resistor, the first end of the sixth resistor and the first end of the seventh resistor; the cathode of the second voltage regulator diode is connected to the cathode of the second diode, and the anode of the second voltage regulator diode is grounded.

7. The power consumption detection circuit according to claim 6, characterized in that: The voltage stabilizing circuit further includes: a second capacitor; The first end of the second capacitor is respectively connected to the cathode of the first rectifier diode, the first end of the fifth resistor, the first end of the sixth resistor and the first end of the seventh resistor, and the second end of the second capacitor is grounded.

8. The power consumption detection circuit according to claim 6, characterized in that: The voltage stabilizing circuit further includes: a third capacitor; A first end of the third capacitor is respectively connected to the cathode of the second rectifier diode and the first end of the delay circuit, and a second end of the third capacitor is grounded.

9. A power consumption detection tool, characterized in that: The power consumption detection tool adopts the power consumption detection circuit as described in any one of claims 1-8.

10. A power consumption detection system, characterized in that: The power consumption detection system adopts the power consumption detection tool as described in claim 9.

Images