CN112491027A - Direct-current power supply error-proofing control circuit and method and household appliance - Google Patents
Direct-current power supply error-proofing control circuit and method and household appliance Download PDFInfo
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- CN112491027A CN112491027A CN202011436175.9A CN202011436175A CN112491027A CN 112491027 A CN112491027 A CN 112491027A CN 202011436175 A CN202011436175 A CN 202011436175A CN 112491027 A CN112491027 A CN 112491027A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
- H02H11/003—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection using a field effect transistor as protecting element in one of the supply lines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
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Abstract
The invention discloses a direct-current power supply mistake-proofing control circuit, a method and household electrical appliance equipment, wherein the control circuit comprises a reverse-connection-proofing unit, a power supply control switch unit and a main control unit, wherein the reverse-connection-proofing unit is in a reverse cut-off state when the positive electrode and the negative electrode of a direct-current power supply are reversely connected so as to disconnect a power supply loop of the direct-current power supply, and is in a forward conduction state when the positive electrode and the negative electrode of the direct-current power supply are correctly connected so as to enable the main control unit to be electrified; after the main control unit is powered on, the anti-reverse connection unit is controlled to work so that the power supply loop meets the requirement of load power supply; the main control unit detects the input voltage of the direct current power supply after the reverse connection prevention unit works, and controls the connection or disconnection of the power supply control switch unit according to the input voltage of the direct current power supply and the load control signal. Therefore, the load can be protected when the direct current power supply is connected reversely or the input voltage of the direct current power supply is abnormal.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a direct-current power supply error-proofing control circuit, a direct-current power supply error-proofing control method and household electrical appliance equipment.
Background
When a load is supplied with a dc power source, the dc power source is generally directly input to the load. However, when the positive and negative poles of the dc power source are reversed or the input voltage of the dc power source is abnormal (e.g., too high, too low, or unstable), the load may be damaged.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first object of the present invention is to provide an error protection control circuit for a dc power supply, which can protect a load when the dc power supply is connected reversely or the input voltage of the dc power supply is abnormal.
A second object of the present invention is to provide a home appliance.
The third purpose of the invention is to provide a DC power supply error-proofing control method for household appliances.
In order to achieve the above object, a first embodiment of the present invention provides an error-proofing control circuit for a dc power supply, including an anti-reverse unit, a power control switch unit and a main control unit, wherein the anti-reverse unit is in a reverse cut-off state when a positive electrode and a negative electrode of the dc power supply are reversed, so as to disconnect a power supply loop of the dc power supply, and is in a forward conduction state when the positive electrode and the negative electrode of the dc power supply are correctly connected, so as to enable the main control unit to be powered; the first output end of the main control unit is connected with the control end of the anti-reverse-connection preventing unit, and the anti-reverse-connection preventing unit is controlled to work after the main control unit is powered on so that a power supply loop meets the requirement of load power supply; the power control switch unit is connected in the power supply loop, and the control end of the power control switch unit is connected with the second output end of the main control unit, wherein the main control unit detects the input voltage of the direct-current power supply after the anti-reverse connection unit works, and controls the connection or disconnection of the power control switch unit according to the input voltage of the direct-current power supply and the load control signal.
According to the error-proofing control circuit of the direct-current power supply, the reverse connection prevention unit is in a reverse cut-off state when the positive electrode and the negative electrode of the direct-current power supply are connected reversely, so that a power supply loop of the direct-current power supply is disconnected, and a load is protected; meanwhile, when the positive electrode and the negative electrode of the direct current power supply are correctly connected, the direct current power supply is in a forward conduction state, so that the main control unit is electrified, the anti-reverse connection unit is controlled to work after the main control unit is electrified, so that the power supply loop meets the power supply requirement of the load, the input voltage of the direct current power supply is detected after the anti-reverse connection unit works, the conduction or the disconnection of the power supply control switch unit is controlled according to the input voltage of the direct current power supply and a load control signal, and the power supply loop is disconnected when the input voltage of the direct current power supply is abnormal so as to protect.
According to one embodiment of the invention, one end of the reverse connection prevention unit is connected with the negative pole of the direct current power supply, the other end of the reverse connection prevention unit is respectively connected with one end of the main control unit and one end of the power supply control switch unit, the other end of the main control unit is connected with the positive pole of the direct current power supply, and the other end of the power supply control switch unit is connected with the positive pole of the direct current power supply through a load.
According to an embodiment of the present invention, the main control unit is configured to control the power control switch unit to be in an off state when the input voltage of the dc power supply is not in the preset voltage interval, so as to disable the load, and to issue the fault indication information.
According to an embodiment of the present invention, the main control unit is configured to control the power control switch unit to be in a conducting state when the input voltage of the dc power supply is in a preset voltage interval and the load control signal is received, so as to power the load.
According to an embodiment of the present invention, the main control unit is configured to continuously detect the input voltage of the dc power supply during the load operation, and control the power control switch unit to turn off when the input voltage of the dc power supply is not within a preset voltage interval and continues for a preset time.
According to an embodiment of the present invention, the reverse connection preventing unit includes: a first diode, a cathode of which is connected to a negative electrode of the DC power supply, and an anode of which is connected to a ground terminal of the power control switch unit; the first end of the first MOS tube is connected with the cathode of the first diode, the second end of the first MOS tube is connected with the anode of the first diode, and the control end of the first MOS tube is connected with the first output end of the main control unit.
According to an embodiment of the present invention, a power control switch unit includes: one end of the first resistor is connected with the second output end of the main control unit; one end of the second resistor is connected with the other end of the first resistor and is provided with a first node, and the other end of the second resistor is grounded and is used as a grounding end of the power supply control switch unit; the base electrode of the first triode is connected with the first node, and the emitting electrode of the first triode is grounded; one end of the third resistor is connected with the collector of the first triode; one end of the fourth resistor is connected with the other end of the third resistor and is provided with a second node, and the other end of the fourth resistor is connected to a preset power supply; a base electrode of the second triode is connected with the second node, and a collector electrode of the second triode is connected to a preset power supply; a base electrode of the third triode is connected with the second node, an emitting electrode of the third triode is connected with an emitting electrode of the second triode and is provided with a third node, and a collecting electrode of the third triode is grounded; one end of the fifth resistor is connected with the third node; one end of the sixth resistor is connected with the other end of the fifth resistor and is provided with a fourth node, and the other end of the sixth resistor is grounded; the first capacitor is connected with the sixth resistor in parallel; the control end of the second MOS tube is connected with the fourth node, the first end of the second MOS tube is connected to a load GND, and the second end of the second MOS tube is grounded; and the second capacitor is connected between the first end and the second end of the second MOS tube.
In order to achieve the above object, a second aspect of the present invention provides a household electrical appliance, including the error-proofing control circuit for dc power supply.
According to the household appliance provided by the embodiment of the invention, through the direct-current error-proofing control circuit, the load can be protected when the direct-current power supply is connected reversely or the input voltage of the direct-current power supply is abnormal.
In order to achieve the above object, a method for controlling an error protection of a dc power supply of a home appliance according to a third embodiment of the present invention is provided, where the home appliance includes the error protection control circuit of the dc power supply, and the method includes the following steps: detecting the connection state of the positive electrode and the negative electrode of the direct current power supply through the reverse connection prevention unit; when the positive electrode and the negative electrode of the direct current power supply are correctly connected, the main control unit is powered on and controls the reverse connection prevention unit to work so that the power supply loop meets the load power supply requirement; and detecting the input voltage of the direct-current power supply, and controlling the on or off of the power supply control switch unit according to the input voltage of the direct-current power supply and the load control signal.
According to the error-proofing control method for the direct current power supply of the household appliance equipment, the anti-reverse connection unit is used for detecting the connection state of the positive electrode and the negative electrode of the direct current power supply, when the positive electrode and the negative electrode of the direct current power supply are correctly connected, the main control unit is powered on and controls the anti-reverse connection unit to work so that a power supply loop meets the power supply requirement of a load, then the input voltage of the direct current power supply is detected, and the on-off of the power control switch unit is controlled according to the input voltage of the direct current power supply and a load control signal, so that the power supply loop is disconnected when the input voltage of the direct current power supply is abnormal to protect the.
According to one embodiment of the invention, when the input voltage of the direct current power supply is not in the preset voltage interval, the power supply control switch unit is controlled to be in the off state, so that the load cannot be powered, and fault prompt information is sent.
According to an embodiment of the present invention, when the input voltage of the dc power supply is within the preset voltage range and the load control signal is received, the power control switch unit is controlled to be in the on state, so as to power the load.
According to one embodiment of the invention, the input voltage of the direct current power supply is continuously detected in the load operation process, and the power supply control switch unit is controlled to be turned off when the input voltage of the direct current power supply is not in the preset voltage interval and continues for the preset time.
According to one embodiment of the invention, when the positive electrode and the negative electrode of the direct current power supply are connected reversely, the power supply loop of the direct current power supply is in an off state.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a block diagram of a dc power supply error protection control circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a DC power supply error protection control circuit according to an embodiment of the present invention;
fig. 3 is a flowchart of a dc power error prevention control method for a home appliance according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The dc power supply error-proofing control circuit, the home appliance device, and the dc power supply error-proofing control method for the home appliance device according to the embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a block diagram of a dc power error protection control circuit according to an embodiment of the present invention, and referring to fig. 1, the dc power error protection control circuit includes: a reverse connection prevention unit 110, a power control switch unit 120, and a main control unit 130.
The reverse connection preventing unit 110 is in a reverse cut-off state when the positive electrode and the negative electrode of the dc power supply 140 are connected reversely, so as to disconnect the power supply loop of the dc power supply 140, and is in a forward conduction state when the positive electrode and the negative electrode of the dc power supply 140 are connected correctly, so as to electrify the main control unit 130. The first output end of the main control unit 130 is connected to the control end of the reverse connection preventing unit 110, and after the main control unit 130 is powered on, the reverse connection preventing unit 110 is controlled to work so that the power supply loop meets the power supply requirement of the load 150. The power control switch unit 120 is connected in the power supply loop, and a control terminal of the power control switch unit 120 is connected to the second output terminal of the main control unit 130. The main control unit 130 detects the input voltage of the dc power supply 140 after the reverse connection preventing unit 110 operates, and controls the on/off of the power control switch unit 120 according to the input voltage of the dc power supply 140 and the load control signal.
Specifically, the main control Unit 130 may be an MCU (Micro Controller Unit), or other devices with signal processing and control functions, which is not limited in this embodiment. When the positive and negative poles of the dc power supply 140 are correctly connected, the reverse connection preventing unit 110 is turned on in the forward direction, and the main control unit 130 is powered up. After the main control unit 130 is powered on, the reverse connection preventing unit 110 is controlled to work so that the power supply loop meets the power supply requirement of the load 150, and the main control unit 130 further detects the voltages at the two ends of the direct current power supply 140 and controls the power control switch unit 120 to be switched on when the voltages at the two ends of the direct current power supply 140 are judged to be normal, so that the direct current power supply 140 supplies power to the load 150 through the power supply loop; when the main control unit 130 determines that the voltage across the dc power supply 140 is abnormal, the power control switch unit 120 is controlled to be turned off to disconnect the power supply loop, so as to prevent the abnormal operation or damage of the load 150 caused by the abnormal operation of the dc power supply 140.
When the connection of the positive electrode and the negative electrode of the dc power supply 140 is wrong, the reverse connection preventing unit 110 is reversely cut off, so that the power supply loop of the dc power supply is disconnected, and the load 150 cannot be powered on, thereby protecting the load 150 when the dc power supply 140 is reversely connected.
In the above embodiment, the reverse connection preventing unit is in a reverse cut-off state when the positive electrode and the negative electrode of the dc power supply are connected reversely, so that the power supply loop of the dc power supply is disconnected, thereby protecting the load; meanwhile, the reverse connection preventing unit is in a forward conduction state when the positive electrode and the negative electrode of the direct current power supply are correctly connected, so that the main control unit is powered on, the reverse connection preventing unit is controlled to work after the main control unit is powered on, so that the power supply loop meets the power supply requirement of the load, the input voltage of the direct current power supply is detected after the reverse connection preventing unit works, the conduction or the disconnection of the power supply control switch unit is controlled according to the input voltage of the direct current power supply and a load control signal, and the power supply loop is disconnected when the input voltage of the direct current power supply is abnormal so as to protect the load.
In one embodiment, as shown in fig. 1, one end of the reverse connection preventing unit 110 is connected to the negative electrode of the dc power source 140, the other end of the reverse connection preventing unit 110 is connected to one end of the main control unit 130 and one end of the power control switch unit 120, the other end of the main control unit 130 is connected to the positive electrode of the dc power source 140, and the other end of the power control switch unit 120 is connected to the positive electrode of the dc power source 140 through the load 150.
Further, the main control unit 130 is configured to: when the input voltage of the dc power supply 140 is not within the preset voltage range, the power control switch unit 120 is controlled to be in an off state, so that the load 150 is not powered on and a fault message is sent; when the input voltage of the dc power supply 140 is within the preset interval and the load control signal is received, the power switch unit 120 is controlled to be in a conducting state, so that the load 150 is powered; during the operation of the load 150, the input voltage of the dc power supply 140 is continuously detected, and the power control switch unit 120 is controlled to be turned off when the input voltage of the dc power supply 140 is not within the preset voltage interval and continues for the preset time.
Specifically, when the direct current power supply 140 is correctly wired, the main control unit 130 is powered on, and detects the input voltage Ui of the direct current power supply 140, and when the input voltage is in a preset voltage interval, that is, the input voltage meets U1< Ui < U2(U1, U2 may be set according to actual conditions), it is determined that the input voltage of the direct current power supply 140 is normal, and at this time, if the main control unit 130 receives a load control signal (for example, a start signal of a load), the main control unit 130 controls the power control switch unit 120 to be turned on according to the load control signal, so that the power supply loop is turned on, and the load 150 may be powered to operate. On the contrary, if the input voltage is not within the preset voltage range, the main control unit 130 determines that the input voltage of the dc power supply 140 is abnormal, and controls the power control switch unit 120 to turn off to protect the load 150. During the operation of the load 150, the main control unit 130 continuously detects the input voltage Ui of the dc power supply 140, and when the input voltage Ui does not satisfy U1< Ui < U2 for the duration time T (the time T is set according to the actual situation), the main control unit 130 controls the power control switch unit 120 to turn off to protect the load 150. When the load 150 fails, the main control unit 130 may further control the power control switch unit 120 to be turned off according to a failure signal of the load 150, so that the load 150 is powered off, thereby having no standby power consumption.
In one embodiment, as shown in fig. 2, the reverse connection preventing unit 110 includes a first diode D1 and a first MOS transistor M1. A cathode of the first diode D1 is connected to a cathode of the dc power supply 140, and an anode of the first diode D1 is connected to a ground terminal of the power control switch unit 120; a first terminal of the first MOS transistor M1 is connected to the cathode of the first diode D1, a second terminal of the first MOS transistor M1 is connected to the anode of the first diode D1, and a control terminal of the first MOS transistor M1 is connected to the first output terminal of the main control unit 130. In this embodiment, the first MOS transistor M1 may be an N-channel MOS transistor (i.e., an NMOS) or a P-channel MOS transistor (i.e., a PMOS), and the embodiment is described by taking the first MOS transistor M1 as an NMOS as an example, the first end of the first MOS transistor M1 is a drain of the NMOS, the second end of the first MOS transistor M1 is a source of the NMOS, and the control end of the first MOS transistor M1 is a gate of the NMOS. When the main control unit 130 outputs a high level to the gate, the first MOS transistor M1 is turned on; when the main control unit 130 outputs a low level to the gate, the first MOS transistor M1 is turned off.
Further, as shown in fig. 2, the power control switch unit 120 includes: the circuit comprises a first resistor R1, a second resistor R2, a first triode Q1, a third resistor R3, a fourth resistor R4, a second triode Q2, a third triode Q3, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second MOS transistor M2 and a second capacitor C2. One end of the first resistor R1 is connected to the second output terminal of the main control unit 130; one end of the second resistor R2 is connected to the other end of the first resistor R1 and has a first node a, and the other end of the second resistor R2 is grounded and serves as the ground terminal of the power control switch unit 120; the base electrode of the first triode Q1 is connected with the first node A, and the emitter electrode of the first triode Q1 is grounded; one end of the third resistor R3 is connected with the collector of the first triode Q1; one end of the fourth resistor R4 is connected to the other end of the third resistor R3 and has a second node B, and the other end of the fourth resistor R4 is connected to the preset power VCC; the base electrode of the second triode Q2 is connected with the second node B, and the collector electrode of the second triode Q2 is connected with a preset power supply VCC; the base electrode of the third triode Q3 is connected with the second node B, the emitter electrode of the third triode Q3 is connected with the emitter electrode of the second triode Q2 and is provided with a third node C, and the collector electrode of the third triode Q3 is grounded; one end of the fifth resistor R5 is connected to the third node C; one end of the sixth resistor R6 is connected to the other end of the fifth resistor R5 and has a fourth node D, and the other end of the sixth resistor R6 is grounded; the first capacitor C1 is connected with the sixth resistor R6 in parallel; the control end of the second MOS transistor M2 is connected to the fourth node D, the first end of the second MOS transistor M2 is connected to the load 150, and the second end of the second MOS transistor M2 is grounded; the second capacitor C2 is connected between the first terminal and the second terminal of the second MOS transistor M2.
In the above embodiment, the first transistor Q1 and the third transistor Q3 may be npn transistors, the second transistor Q2 may be a pnp transistor, the second MOS transistor M2 may be an N-channel MOS transistor, the first section of the second MOS transistor M2 may be a drain of an NMOS, the second end of the second MOS transistor M2 may be a source of an NMOS, the control end of the second MOS transistor M2 may be a gate of an NMOS, and the second MOS transistor may be turned on under the action of a high level and turned off under the action of a low level.
When the positive and negative electrodes of the dc power supply 140 are connected correctly, the first diode D1 is turned on in the forward direction, the main control unit 130 is powered, and the main control unit 130 sends a control signal to control the first MOS transistor M1 to be turned on, and the current capacity of the first MOS transistor M1 is much greater than that of the first diode D1. The current capacity of the first MOS transistor M1 needs to match the power level of the subsequent load 150, and when the power of the load 150 is larger, the load 150 can be satisfied by parallel connection of MOS transistors.
After the main control unit 130 is powered on, it is determined whether a load control signal (e.g., a start signal) of the load 150 is received, if the load control signal is received, the main control unit 130 collects an input voltage Ui of the dc power supply 140, and determines whether the input voltage Ui is between the preset voltage intervals U1-U2, if the input voltage Ui is between the preset voltage intervals, that is, the input voltage Ui satisfies U1< Ui < U2, the main control unit 130 controls the power control switch unit 120 to be turned on according to the load control signal. When the main control unit 130 controls the power control switch unit 120 to be turned on, a low level signal can be output to the base of the first triode Q1 through the second output end, the first triode Q1 is cut off under the action of a low level, so that the second node B is a high level, and further the second triode Q2 is turned on, the third triode Q3 is cut off, the preset power VCC controls the second MOS transistor M2 to be turned on through the second triode Q2, so that the power supply loop between the direct current power supply 140 and the load 150 is turned on, and the load 150 can be powered on to work. The MOS transistor has stronger current capacity, and when the power of the load 150 is larger, the requirement of the load 150 can be met in a mode of connecting the MOS transistor in parallel. When the main control unit 130 determines that the input voltage Ui does not satisfy U1< Ui < U2, the second output terminal of the main control unit 130 outputs a high level signal, so that the first triode Q1 is turned on, the second node B is a low level, the second triode Q2 is turned off, the third triode Q3 is turned on, the fourth node D is a low level, the second MOS switch M2 is turned off under the action of the low level, so that the power supply loop between the dc power supply 140 and the load 150 is disconnected, the load 150 is not powered, and the load 150 can be protected when the input voltage of the dc power supply 140 is abnormal.
When the positive electrode and the negative electrode of the dc power supply 140 are connected in reverse, the first diode D1 is cut off in reverse, the power supply circuit is disconnected, and the load 150 cannot be powered, so that the load 150 can be protected when the positive electrode and the negative electrode of the dc power supply 140 are connected in reverse by using the first diode D1.
When the load 150 has a fault, a fault signal may be sent to the main control unit 130, and the main control unit 130 controls the power control switch unit 120 to turn off through the second output terminal according to the fault signal, so that the power supply loop between the dc power supply 140 and the load 150 is disconnected, and the load 150 is not powered, so that there is no standby power consumption when the load 150 has a fault.
The error-proofing control circuit for the direct-current power supply provided by the embodiment can control the power supply loop to be disconnected when the direct-current power supply is reversely connected or the input voltage of the direct-current power supply is abnormal so as to protect the load and prevent the load from being abnormal, and control the power supply loop to be disconnected when the load fails so as to ensure that the load cannot be powered, so that the load is protected when the load fails, and meanwhile, no standby power consumption is realized.
In addition, another embodiment of the present application provides a household electrical appliance, which includes the aforementioned error-proofing control circuit for a dc power supply.
According to the household appliance provided by the embodiment of the invention, through the direct-current error-proofing control circuit, the load can be protected when the direct-current power supply is connected reversely or the input voltage of the direct-current power supply is abnormal.
As shown in fig. 3, another embodiment of the present application provides a dc power error-proofing control method for a home appliance, where the home appliance includes the dc power error-proofing control circuit, and the method includes the following steps:
and step S110, detecting the connection state of the positive electrode and the negative electrode of the direct current power supply through the reverse connection prevention unit.
And step S130, when the positive electrode and the negative electrode of the direct current power supply are correctly connected, the main control unit is powered on, and controls the reverse connection prevention unit to work so that the power supply loop meets the power supply requirement of the load.
In one embodiment, when the positive electrode and the negative electrode of the direct current power supply are connected reversely, the power supply loop of the direct current power supply is in an off state, and the load cannot be powered.
Step S150, detecting an input voltage of the dc power supply, and controlling on or off of the power control switch unit according to the input voltage of the dc power supply and the load control signal.
In some embodiments, when the input voltage of the direct current power supply is not in a preset voltage interval, the power supply control switch unit is controlled to be in a turn-off state, so that the load cannot be powered on, and fault prompt information is sent out; when the input voltage of the direct current power supply is in a preset voltage interval and a load control signal is received, controlling the power supply control switch unit to be in a conducting state so as to enable the load to be electrified; the method comprises the steps of continuously detecting the input voltage of the direct current power supply in the load operation process, and controlling the power supply control switch unit to be switched off when the input voltage of the direct current power supply is not in a preset voltage interval and continues for a preset time.
It should be noted that, for the description of the dc power error-proofing control method for the household electrical appliance in the present application, reference may be made to the description of the dc power error-proofing control circuit in the present application, and details are not repeated herein.
According to the error-proofing control method for the direct current power supply of the household appliance equipment, the anti-reverse connection unit is used for detecting the connection state of the positive electrode and the negative electrode of the direct current power supply, when the positive electrode and the negative electrode of the direct current power supply are correctly connected, the main control unit is powered on and controls the anti-reverse connection unit to work so that a power supply loop meets the power supply requirement of a load, then the input voltage of the direct current power supply is detected, and the on-off of the power control switch unit is controlled according to the input voltage of the direct current power supply and a load control signal, so that the power supply loop is disconnected when the input voltage of the direct current power supply is abnormal to protect the.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
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, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (13)
1. A DC power supply error-proofing control circuit is characterized by comprising an anti-reverse connection unit, a power supply control switch unit and a main control unit, wherein,
the reverse connection prevention unit is in a reverse cut-off state when the positive electrode and the negative electrode of the direct current power supply are in reverse connection so as to disconnect a power supply loop of the direct current power supply, and is in a forward conduction state when the positive electrode and the negative electrode of the direct current power supply are correctly connected so as to enable the main control unit to be electrified;
the first output end of the main control unit is connected with the control end of the reverse connection prevention unit, and the main control unit controls the reverse connection prevention unit to work after being powered on so that the power supply loop meets the power supply requirement of a load;
the power control switch unit is connected in the power supply loop, the control end of the power control switch unit is connected with the second output end of the main control unit, the main control unit detects the input voltage of the direct current power supply after the reverse connection prevention unit works, and the power control switch unit is controlled to be switched on or switched off according to the input voltage of the direct current power supply and the load control signal.
2. The dc power source error-proofing control circuit according to claim 1, wherein one end of the reverse-connection-proofing unit is connected to a negative electrode of the dc power source, the other end of the reverse-connection-proofing unit is respectively connected to one end of the main control unit and one end of the power control switch unit, the other end of the main control unit is connected to a positive electrode of the dc power source, and the other end of the power control switch unit is connected to the positive electrode of the dc power source through a load.
3. The dc power supply fault-protection circuit according to claim 1 or 2, wherein the main control unit is configured to control the power control switch unit to be in an off state when the input voltage of the dc power supply is not in a preset voltage interval, so as to prevent the load from being powered and send out a fault notification message.
4. The dc power error-proofing control circuit according to claim 1 or 2, wherein the main control unit is configured to control the power control switch unit to be in a conducting state when the input voltage of the dc power is in a preset voltage interval and the load control signal is received, so as to power the load.
5. The error-proofing control circuit of the DC power supply according to claim 4, wherein the main control unit is configured to continuously detect the input voltage of the DC power supply during the operation of the load, and control the power control switch unit to turn off when the input voltage of the DC power supply is not within a preset voltage interval and continues for a preset time.
6. The dc power supply error-proofing control circuit according to claim 1 or 2, wherein the anti-reverse-connection unit comprises:
a first diode having a cathode connected to a negative electrode of the DC power supply and an anode connected to a ground terminal of the power control switch unit;
the first end of the first MOS tube is connected with the cathode of the first diode, the second end of the first MOS tube is connected with the anode of the first diode, and the control end of the first MOS tube is connected with the first output end of the main control unit.
7. The error-proofing control circuit for a direct-current power supply according to claim 6, wherein the power supply control switch unit comprises:
one end of the first resistor is connected with the second output end of the main control unit;
one end of the second resistor is connected with the other end of the first resistor and is provided with a first node, and the other end of the second resistor is grounded and is used as a grounding end of the power supply control switch unit;
a base electrode of the first triode is connected with the first node, and an emitting electrode of the first triode is grounded;
one end of the third resistor is connected with the collector of the first triode;
one end of the fourth resistor is connected with the other end of the third resistor and is provided with a second node, and the other end of the fourth resistor is connected to a preset power supply;
a base electrode of the second triode is connected with the second node, and a collector electrode of the second triode is connected to a preset power supply;
a base electrode of the third triode is connected with the second node, an emitting electrode of the third triode is connected with an emitting electrode of the second triode and is provided with a third node, and a collecting electrode of the third triode is grounded;
one end of the fifth resistor is connected with the third node;
one end of the sixth resistor is connected with the other end of the fifth resistor and is provided with a fourth node, and the other end of the sixth resistor is grounded;
the first capacitor is connected with the sixth resistor in parallel;
a control end of the second MOS tube is connected with the fourth node, a first end of the second MOS tube is connected to a load GND, and a second end of the second MOS tube is grounded;
and the second capacitor is connected between the first end and the second end of the second MOS tube.
8. An electric home appliance comprising a dc power supply error protection control circuit according to any one of claims 1 to 7.
9. A dc power error-proofing control method for a home appliance, wherein the home appliance comprises the dc power error-proofing control circuit according to any one of claims 1 to 7, the method comprising the steps of:
detecting the connection state of the positive electrode and the negative electrode of the direct current power supply through the reverse connection prevention unit;
when the positive electrode and the negative electrode of the direct current power supply are correctly connected, the main control unit is powered on and controls the reverse connection prevention unit to work so that the power supply loop meets the load power supply requirement;
and detecting the input voltage of the direct-current power supply, and controlling the on or off of the power supply control switch unit according to the input voltage of the direct-current power supply and the load control signal.
10. The dc power source error-proofing control method for home appliances according to claim 9, wherein the power control switch unit is controlled to be in an off state when the input voltage of the dc power source is not in a preset voltage interval, so that the load is not powered and a fault indication message is sent.
11. The dc power error-proofing control method for home appliances according to claim 9, wherein the power control switch unit is controlled to be in a conducting state when the input voltage of the dc power is in a preset voltage interval and the load control signal is received, so as to power the load.
12. The dc power error-proofing control method for home appliances according to claim 11, wherein the input voltage of the dc power is continuously detected during the operation of the load, and the power control switching unit is controlled to be turned off when the input voltage of the dc power is not within a preset voltage interval and continues for a preset time.
13. The error-proofing control method for the direct-current power supply of the household electrical appliance according to any one of claims 9 to 12, wherein when the positive and negative poles of the direct-current power supply are reversed, the power supply loop of the direct-current power supply is in an off state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011436175.9A CN112491027A (en) | 2020-12-07 | 2020-12-07 | Direct-current power supply error-proofing control circuit and method and household appliance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011436175.9A CN112491027A (en) | 2020-12-07 | 2020-12-07 | Direct-current power supply error-proofing control circuit and method and household appliance |
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| CN112491027A true CN112491027A (en) | 2021-03-12 |
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| CN202011436175.9A Pending CN112491027A (en) | 2020-12-07 | 2020-12-07 | Direct-current power supply error-proofing control circuit and method and household appliance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115167232A (en) * | 2022-07-27 | 2022-10-11 | 广达创芯电子技术(杭州)有限公司 | Load protection alarm circuit of double MOS |
-
2020
- 2020-12-07 CN CN202011436175.9A patent/CN112491027A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115167232A (en) * | 2022-07-27 | 2022-10-11 | 广达创芯电子技术(杭州)有限公司 | Load protection alarm circuit of double MOS |
| CN115167232B (en) * | 2022-07-27 | 2023-10-31 | 广达创芯电子技术(杭州)有限公司 | double-MOS load protection alarm circuit |
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