Discharging circuit and electrical equipment

Abstract

The utility model relates to a discharge circuit and electrical equipment, and belongs to the technical field of household electrical appliance discharge, the discharge circuit comprises a main control chip, and a voltage zero-cross detection circuit and a load discharge circuit which are respectively electrically connected with the main control chip, the voltage zero-cross detection circuit is electrically connected with a power plug, the power plug comprises a first insertion sheet and a second insertion sheet, and the first insertion sheet is electrically connected with the load discharge circuit. The load discharging circuit is electrically connected with the power plug, and a first capacitor is arranged between the first insertion piece and the second insertion piece; according to the utility model, the plugging state of the power plug is determined through the voltage zero-cross detection circuit, and when the power plug is in the plugging state, the power plug is discharged through the load discharging circuit, so that residual electric energy in an electric appliance can be discharged, and waste of electric energy can be effectively avoided.

Description

Technical Field

[0001] This utility model belongs to the field of household appliance discharge technology, specifically relating to a discharge circuit and electrical equipment. Background Technology

[0002] Household appliances must comply with the "Electromagnetic Compatibility Requirements for Household Appliances, Power Tools and Similar Apparatus". Therefore, when rectifying electromagnetic compatibility issues, an X capacitor should be used on the side near the power input for power filtering. If the X capacitor is too large, residual voltage may remain on the plug even after it has been unplugged for a period of time, posing a safety hazard of electric shock to the user.

[0003] In existing technology, a resistor is usually connected in parallel across the X capacitor to discharge the capacitor after the power plug is unplugged. When the X capacitor is too large, a resistor with a smaller resistance and a larger power rating is required to meet the requirements for plug discharge. Using this resistor will increase the power consumption of the appliance and cause energy waste. Utility Model Content

[0004] Therefore, this utility model provides a discharge circuit and electrical equipment to solve the problem of energy waste caused by using resistors with small resistance values ​​and large power specifications when the capacitor is too large under power filtering in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, this utility model provides a discharge circuit, which is applied to the power plug of an electrical device, and the discharge circuit includes:

[0007] The main control chip, and a voltage zero-crossing detection circuit and a load discharge circuit that are electrically connected to the main control chip respectively;

[0008] The zero-crossing voltage detection circuit is electrically connected to the power plug; the power plug includes a first plug and a second plug; a first capacitor is disposed between the first plug and the second plug.

[0009] The load discharge circuit is electrically connected to the power plug.

[0010] Furthermore, the voltage zero-crossing detection circuit includes:

[0011] First resistor, second resistor, diode and optocoupler;

[0012] The first end of the first resistor is electrically connected to the first plug-in, and the second end of the first resistor is electrically connected to the cathode of the diode and the first pin of the optocoupler, respectively.

[0013] The anode of the diode is electrically connected to the second insert and the second pin of the optocoupler, respectively.

[0014] The fourth pin of the optocoupler is electrically connected to the fourth pin of the main control chip and the first end of the second resistor, respectively, and the third pin of the optocoupler is connected to low voltage ground;

[0015] The second end of the second resistor is electrically connected to the first power supply.

[0016] Furthermore, the load discharge circuit includes:

[0017] Third resistor, fourth resistor, transistor, relay, switch and discharge load;

[0018] The first end of the fourth resistor is electrically connected to the fifth pin of the main control chip; the second end of the fourth resistor is electrically connected to the base of the transistor.

[0019] The collector of the transistor is electrically connected to the first end of the third resistor, and the emitter of the transistor is connected to a low-voltage ground.

[0020] The second end of the third resistor is electrically connected to the relay;

[0021] The relay is electrically connected to a second power source; the relay is connected to the switch to control the closing or opening of the switch.

[0022] The first end of the switch is electrically connected to the first plug, and the second end of the switch is electrically connected to the second end of the discharge load;

[0023] The first end of the discharge load is electrically connected to the second plug.

[0024] Furthermore, the first pin of the main control chip is electrically connected to the first power supply, and the second pin of the main control chip is connected to low-voltage ground.

[0025] Furthermore, the discharge circuit also includes:

[0026] The system includes a rectifier bridge, a second capacitor, and a transformer module; the second capacitor is a polarized capacitor.

[0027] The first end of the rectifier bridge is electrically connected to the second plug and the first end of the first capacitor, the second end of the rectifier bridge is electrically connected to the first plug and the second end of the first capacitor, the third end of the rectifier bridge is electrically connected to the positive terminal of the second capacitor and the first pin of the transformer module, the fourth end of the rectifier bridge is electrically connected to the negative terminal of the second capacitor and the second pin of the transformer module, and the fourth end of the rectifier bridge is connected to high voltage ground.

[0028] The third pin of the transformer module is connected to low-voltage ground;

[0029] The fourth pin of the transformer module serves as the first power supply and is electrically connected to the second terminal of the second resistor and the first pin of the main control chip, respectively.

[0030] The fifth pin of the transformer module is electrically connected to the relay as the second power supply.

[0031] Furthermore, the discharge load is an external load.

[0032] Secondly, this utility model provides an electrical device, which includes any of the discharge circuits described above.

[0033] The present invention, by adopting the above technical solution, has at least the following beneficial effects:

[0034] This application provides a discharge circuit and an electrical device. The discharge circuit includes a main control chip and a voltage zero-crossing detection circuit and a load discharge circuit, which are electrically connected to the main control chip respectively. The voltage zero-crossing detection circuit is electrically connected to a power plug. The power plug includes a first plug and a second plug. The load discharge circuit is electrically connected to the power plug. A first capacitor is disposed between the first plug and the second plug. This utility model determines the plug insertion / removal state of the power plug through the voltage zero-crossing detection circuit. Discharge is only performed through the load discharge circuit when the power plug is in the unplugged state. This ensures that the residual electrical energy in the electrical appliance is discharged and effectively avoids the waste of electrical energy.

[0035] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic block diagram of a discharge circuit shown in an exemplary embodiment of the present invention;

[0038] Figure 2 This is a circuit diagram illustrating a discharge circuit according to an exemplary embodiment of the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0040] Household appliances must comply with the "Electromagnetic Compatibility Requirements for Household Appliances, Power Tools and Similar Apparatus". Therefore, when rectifying electromagnetic compatibility issues, an X capacitor should be used on the side near the power input for power filtering. If the X capacitor is too large, residual voltage may remain on the plug even after it has been unplugged for a period of time, posing a safety hazard of electric shock to the user. Therefore, the "Safety Standard for Household and Similar Electrical Appliances" requires that the voltage on the power plug must be below 34V one second after unplugging, which is within the safe voltage range.

[0041] Current technology typically involves connecting a resistor in parallel across the X capacitor to provide a discharge circuit after the power plug is unplugged, ensuring the voltage drops below 34V after one second. When the X capacitor is too large, a resistor with a smaller resistance and higher power rating is needed to meet the plug discharge requirements. Using this resistor increases the appliance's power consumption, causing the standby power consumption to exceed energy efficiency requirements.

[0042] This utility model mainly introduces a discharge circuit, which is applied to the power plug of electrical equipment. It uses a voltage zero-crossing detection circuit to monitor the moment when the appliance is unplugged, and then controls the AC load discharge circuit of the load discharge circuit through the main control chip to consume the residual charge of the X capacitor at the moment when the AC load is turned on. In this way, even if the whole machine meets the requirements of power plug discharge standard, electromagnetic compatibility standard and whole machine standby power consumption standard, it can effectively avoid electric shock injury to production operators.

[0043] The discharge circuit of this utility model will be described below through specific embodiments.

[0044] Please see Figure 1 , Figure 1 This is a schematic block diagram of a discharge circuit illustrating an exemplary embodiment of the present invention. See also: Figure 1 The discharge circuit includes:

[0045] The main control chip and the voltage zero-crossing detection circuit and load discharge circuit, which are electrically connected to the main control chip respectively;

[0046] The voltage zero-crossing detection circuit is electrically connected to the power plug;

[0047] The load discharge circuit is electrically connected to the power plug.

[0048] Specifically, the power plug includes a first plug and a second plug; a first capacitor is disposed between the first plug and the second plug.

[0049] It should be noted that the technical solution provided in this embodiment is commonly used in household appliances in practice. Applicable scenarios include, but are not limited to: range hoods, air conditioners, robot vacuum cleaners, televisions, microwave ovens, vacuum cleaners, washing machines, refrigerators, ovens, humidifiers, soy milk makers, electric pressure cookers, induction cookers, and other household appliances that need to discharge after being unplugged.

[0050] It is understood that the discharge circuit provided in this embodiment determines the plug-in / plug-out state of the power plug through the zero-crossing voltage detection circuit. Discharge is only performed through the load discharge circuit when the power plug is unplugged. This ensures that the residual electrical energy in the appliance is discharged and effectively avoids the waste of electrical energy.

[0051] In one embodiment, see Figure 2 , Figure 2 This is a circuit diagram illustrating a discharge circuit of an exemplary embodiment of this utility model. See also: Figure 2 The voltage zero-crossing detection circuit includes: a first resistor R1, a second resistor R2, a diode D1, and an optocoupler U3; the first end of the first resistor R1 is electrically connected to the first plug-in ACL, and the second end of the first resistor R1 is electrically connected to the cathode of the diode D1 and the first pin of the optocoupler U3; the anode of the diode D1 is electrically connected to the second plug-in ACN and the second pin of the optocoupler U3; the fourth pin of the optocoupler U3 is electrically connected to the fourth pin of the main control chip U2 and the first end of the second resistor R2, and the third pin of the optocoupler U3 is connected to the low-voltage ground GND; the second end of the second resistor R2 is electrically connected to the first power supply +VCC.

[0052] It should be noted that during normal operation of the electrical equipment, when the first connector ACL is at a positive voltage, the current in the first connector ACL flows from the first resistor R1 through the optocoupler U3 and back to the second connector ACN. The PN junction in the optocoupler U3 is turned on, and the voltage at pin 4 of the optocoupler U3 is pulled low, outputting a low level to pin 4 of the main control chip U2. When the first connector ACL is at a negative voltage, the current flows from the first connector to the second connector ACN side, through diode D1, through the first resistor R1, and back to the first connector ACL. No current flows inside the optocoupler U3, and the PN junction in the optocoupler U3 is turned off. Pin 4 of the optocoupler U3 is pulled up to the first power supply +VCC by the second resistor R2, outputting a high level to pin 4 of the main control chip U2, thereby realizing the zero-crossing voltage detection of the AC mains power. Based on the zero-crossing voltage detection, the main control chip U2 completes the plug insertion and removal detection.

[0053] It is understood that the discharge circuit provided in this embodiment detects the plug insertion and removal status based on zero-crossing voltage detection, enabling the discharge circuit to react promptly when the power plug is removed, effectively reducing the duration of harmful residual voltage, and at the same time, it does not cause additional power consumption when the electrical equipment is running normally.

[0054] In one embodiment, see Figure 2 The load discharge circuit includes: a third resistor R3, a fourth resistor R4, a transistor Q1, a relay RL1, a switch SA, and a discharge load LOAD; the first end of the fourth resistor R4 is electrically connected to the fifth pin of the main control chip U2; the second end of the fourth resistor R4 is electrically connected to the base of the transistor Q1; the collector of the transistor Q1 is electrically connected to the first end of the third resistor R3, and the emitter of the transistor Q1 is connected to low-voltage ground; the second end of the third resistor R3 is electrically connected to the relay RL1; the relay RL1 is electrically connected to the second power supply +VDD; the relay RL1 is connected to the switch SA to control the closing or opening of the switch SA; the first end of the switch SA is electrically connected to the first plug-in ACL, and the second end of the switch SA is electrically connected to the second end of the discharge load LOAD; the first end of the discharge load LOAD is electrically connected to the second plug-in ACN.

[0055] It should be noted that when the power plug is unplugged, the zero-crossing voltage signal of the main control chip U2 does not change alternately. It is recognized that at the moment the plug is unplugged, the main control chip U2 outputs a high level through pin 5, controls the transistor Q1 to conduct, the coil of relay RL1 is energized, the contacts of relay RL1 are energized, and the charge on the first capacitor CX1 instantly supplies power to the AC load LOAD, consuming electrical energy. After the electrical energy is consumed, the voltage value drops.

[0056] It is understood that the discharge circuit provided in this embodiment can effectively dissipate residual voltage.

[0057] Specifically, the first pin of the main control chip U2 is electrically connected to the first power supply +VCC, and the second pin of the main control chip U2 is connected to the low-voltage ground GND.

[0058] In one embodiment, see Figure 2The discharge circuit also includes: a rectifier bridge BD1, a second capacitor EC1, and a transformer module U1; the second capacitor EC1 is a polarized capacitor; the first terminal of the rectifier bridge BD1 is electrically connected to the first terminal of the second plug-in ACN and the first terminal of the first capacitor CX1, the second terminal of the rectifier bridge BD1 is electrically connected to the second terminal of the first plug-in ACL and the first terminal of the first capacitor CX1, the third terminal of the rectifier bridge BD1 is electrically connected to the positive terminal of the second capacitor EC1 and the first pin of the transformer module U1, the fourth terminal of the rectifier bridge BD1 is electrically connected to the negative terminal of the second capacitor EC1 and the second pin of the transformer module U1, and the fourth terminal of the rectifier bridge BD1 is also connected to the high voltage ground HGND; the third pin of the transformer module U1 is connected to the low voltage ground GND; the fourth pin of the transformer module U1, as the first power supply +VCC, is electrically connected to the second terminal of the second resistor R2 and the first pin of the main control chip U2; the fifth pin of the transformer module U1, as the second power supply +VDD, is electrically connected to the relay RL1.

[0059] It should be noted that the discharge circuit obtains the first power supply +VCC and the second power supply +VDD through the rectifier bridge BD1, the second capacitor EC1 and the transformer module U1, and uses the first power supply +VCC and the second power supply +VDD to provide DC power to the discharge circuit.

[0060] It is understood that the discharge circuit provided in this embodiment, by integrating power supply, can reduce the need for independent power supply equipment, thereby effectively reducing costs.

[0061] In one embodiment, the discharge load is an external load.

[0062] It should be noted that different external loads can be used depending on the specific electrical equipment to achieve better results.

[0063] In one embodiment, an electrical device is also provided, which includes any of the above-described discharge circuits.

[0064] It is understood that the electrical device provided in this embodiment determines the plug-in / plug-out state of the power plug through a voltage zero-crossing detection circuit. Only when the power plug is unplugged will the load discharge circuit discharge the power. This ensures that the residual electrical energy in the electrical device is discharged and effectively avoids the waste of electrical energy.

[0065] In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The embodiments described above merely illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0066] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0067] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A discharge circuit, characterized in that, The discharge circuit is applied to the power plug of electrical equipment, and the discharge circuit includes: The main control chip, and a voltage zero-crossing detection circuit and a load discharge circuit that are electrically connected to the main control chip respectively; The zero-crossing voltage detection circuit is electrically connected to the power plug; the power plug includes a first plug and a second plug; a first capacitor is disposed between the first plug and the second plug. The load discharge circuit is electrically connected to the power plug.

2. The discharge circuit according to claim 1, characterized in that, The voltage zero-crossing detection circuit includes: First resistor, second resistor, diode and optocoupler; The first end of the first resistor is electrically connected to the first plug-in, and the second end of the first resistor is electrically connected to the cathode of the diode and the first pin of the optocoupler, respectively. The anode of the diode is electrically connected to the second insert and the second pin of the optocoupler, respectively. The fourth pin of the optocoupler is electrically connected to the fourth pin of the main control chip and the first end of the second resistor, respectively, and the third pin of the optocoupler is connected to low voltage ground; The second end of the second resistor is electrically connected to the first power supply.

3. The discharge circuit according to claim 2, characterized in that, The load discharge circuit includes: Third resistor, fourth resistor, transistor, relay, switch and discharge load; The first end of the fourth resistor is electrically connected to the fifth pin of the main control chip; the second end of the fourth resistor is electrically connected to the base of the transistor. The collector of the transistor is electrically connected to the first end of the third resistor, and the emitter of the transistor is connected to a low-voltage ground. The second end of the third resistor is electrically connected to the relay; The relay is electrically connected to a second power source; the relay is connected to the switch to control the closing or opening of the switch. The first end of the switch is electrically connected to the first plug, and the second end of the switch is electrically connected to the second end of the discharge load; The first end of the discharge load is electrically connected to the second plug.

4. The discharge circuit according to claim 3, characterized in that, The first pin of the main control chip is electrically connected to the first power supply, and the second pin of the main control chip is connected to low voltage ground.

5. The discharge circuit according to claim 4, characterized in that, The discharge circuit further includes: The system includes a rectifier bridge, a second capacitor, and a transformer module; the second capacitor is a polarized capacitor. The first end of the rectifier bridge is electrically connected to the second plug and the first end of the first capacitor, the second end of the rectifier bridge is electrically connected to the first plug and the second end of the first capacitor, the third end of the rectifier bridge is electrically connected to the positive terminal of the second capacitor and the first pin of the transformer module, the fourth end of the rectifier bridge is electrically connected to the negative terminal of the second capacitor and the second pin of the transformer module, and the fourth end of the rectifier bridge is connected to high voltage ground. The third pin of the transformer module is connected to low-voltage ground; The fourth pin of the transformer module serves as the first power supply and is electrically connected to the second terminal of the second resistor and the first pin of the main control chip, respectively. The fifth pin of the transformer module is electrically connected to the relay as the second power supply.

6. The discharge circuit according to claim 3, characterized in that, The discharge load is an external load.

7. An electrical appliance, characterized in that, The electrical device includes the discharge circuit as described in any one of claims 1-6.

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