Driving control circuit and household appliance

Abstract

The utility model provides a drive control circuit and a household electrical appliance. The drive control circuit comprises a live wire connection end; a zero line connection end; the first input end of the half-wave rectification circuit is connected with the live wire connecting end, the second input end of the half-wave rectification circuit is connected with the zero line connecting end, and the second output end of the half-wave rectification circuit is connected with the first grounding point; the first end of the switching power supply is connected with the first output end of the half-wave rectification circuit, the second end of the switching power supply is connected with the first grounding point, and the fourth end of the switching power supply is connected with the second grounding point; the first end of the temperature sensor is connected with the third end of the switching power supply, and the second end of the temperature sensor is connected with the second grounding point; wherein the first grounding point is a grounding point which is directly or indirectly connected with an alternating current power grid, and the second grounding point is a grounding point which is not directly or indirectly connected with the alternating current power grid. And under the condition that the temperature sensor is broken down and damaged, the electric shock risk can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit technical field, specifically, relate to a drive control circuit and household appliance. BACKGROUND

[0002] In the related technical scheme, the household appliance such as dish washer includes temperature sensor, the temperature sensor is soaked in the water cup of dish washer long-term, to detect the liquid temperature in water cup.

[0003] In the case where the temperature sensor is broken down and damaged, the reference ground of the temperature sensor will be short-circuited with the metal shell of the dish washer through the liquid.

[0004] Among them, the dish washer adopts the rectification scheme of full-wave rectification, specifically, as shown in Figure 1 Full-wave rectification includes first diode D1', second diode D2', third diode D3' and fourth diode D4', the grounding point of full-wave rectification bus will be directly connected together with the grounding point of weak current control, wherein the grounding point of weak current control is the reference ground of the temperature sensor in the foregoing, and the grounding point of full-wave rectification bus after rectification is relatively large pressure difference with respect to the ground, so in the case where the temperature sensor is broken down and damaged, the metal shell of the dish washer will be electrified, and there is the risk of electric shock. SUMMARY

[0005] The utility model aims at least to solve the technical problem of the prior art or related art that the metal shell of the dish washer will be electrified in the case where the temperature sensor is broken down and damaged, and there is the risk of electric shock.

[0006] Therefore, the first aspect of the utility model provides a drive control circuit.

[0007] The second aspect of the utility model provides a household appliance.

[0008] Therefore, according to the first aspect of the utility model, the utility model provides a drive control circuit, which comprises: a live wire connection end; a neutral wire connection end; a half-wave rectification circuit, a first input end of the half-wave rectification circuit is connected with the live wire connection end, a second input end of the half-wave rectification circuit is connected with the neutral wire connection end, a second output end of the half-wave rectification circuit is connected with a first grounding point; a switching power supply, a first end of the switching power supply is connected with the first output end of the half-wave rectification circuit, a second end of the switching power supply is connected with the first grounding point, a fourth end of the switching power supply is connected with a second grounding point; a temperature sensor, a first end of the temperature sensor is connected with a third end of the switching power supply, a second end of the temperature sensor is connected with the second grounding point; wherein the first grounding point is a grounding point directly or indirectly connected with an alternating current network, and the second grounding point is a grounding point not directly or indirectly connected with the alternating current network.

[0009] The utility model provides a drive control circuit, in this drive control circuit, utilize half wave rectifier circuit connection live wire connection end, zero line connection end and switching power supply, make half wave rectifier circuit the first ground point connected with zero line connection end can be directly or indirectly connected.

[0010] In the above technical scheme, the live wire connection end can be understood as a connection end for connecting the live wire, and the zero line connection end can be understood as a connection end for connecting the zero line. The live wire connection end and the zero line connection end can be connected to the live wire and the zero line, thereby connecting the half wave rectifier circuit to the AC power grid, and obtaining AC power from the AC power grid for use by the drive control circuit.

[0011] In the above technical scheme, the switching power supply can be understood as a power supply that can control whether to output power. In the utility model, the switching power supply can be used to obtain power from the half wave rectifier circuit and supply power to the temperature sensor.

[0012] In the above technical scheme, the first grounding point refers to an area directly or indirectly connected to the AC power grid, which can also be referred to as a hot ground. There is a voltage difference between the hot ground and the ground. If a person stands on the ground and directly touches it, there is a risk of electric shock.

[0013] In the above technical scheme, the second grounding point refers to a ground that is not connected to the AC power grid. After isolation by a transformer or components, the ground does not cause harm to the human body, or it only exists in a local circuit and is generally not dangerous to the human body. It can also be referred to as a cold ground.

[0014] In addition, the drive control circuit according to the utility model also has the following additional technical features.

[0015] In some technical solutions, the half wave rectifier circuit includes: a first diode, the anode of the first diode is connected to the live wire connection end; a first electrolytic capacitor, the first end of the first electrolytic capacitor is connected to the cathode of the first diode and the first end of the switching power supply, and the second end of the first electrolytic capacitor is connected to the zero line connection end and the first grounding point.

[0016] In the technical scheme, the half-wave rectification circuit comprises a first diode and a first electrolytic capacitor, the first diode is arranged between the live wire connection end and the first end of the switching power supply, so as to limit the passage of signals of the negative half cycle of the alternating current provided by the alternating current network, at this time, the zero line connection end can be directly connected with the first grounding point, thus, the zero line connected by the zero line connection end can be used as the system reference ground, at this time, in the case that the temperature sensor is damaged due to breakdown, when the reference ground of the temperature sensor is short-circuited with the metal shell of the household appliance through the liquid, there is no large voltage difference between the metal shell of the household appliance and the ground, thus, the risk of electric shock can be reduced.

[0017] In the above technical scheme, the first electrolytic capacitor is connected with the cathode of the first diode and the first grounding point respectively, at this time, the alternating current after rectification by the first diode can form a stable voltage on the first electrolytic capacitor, in the case that the first electrolytic capacitor supplies power to the switching power supply, the switching power supply can be supplied with more stable power supply, so as to ensure the stable output of the switching power supply.

[0018] In the above technical scheme, the first diode can allow the passage of signals of the positive half cycle of the alternating current, and filter out signals of the negative half cycle of the alternating current.

[0019] In some technical schemes, optionally, the half-wave rectification circuit comprises: a first diode, an anode of the first diode being connected with the live wire connection end, and a cathode of the first diode being connected with the first end of the switching power supply; a second diode, a cathode of the second diode being connected with the zero line connection end, and an anode of the second diode being connected with the first grounding point; and a first electrolytic capacitor, a first end of the first electrolytic capacitor being connected with the cathode of the first diode, and a second end of the first electrolytic capacitor being connected with the anode of the second diode.

[0020] In the technical scheme, the half-wave rectification circuit comprises a first diode, a second diode and a first electrolytic capacitor, the first diode and the second diode can be used in cooperation to limit the passage of signals of the negative half cycle of the alternating current provided by the alternating current network, at this time, the zero line connection end can be indirectly connected with the first grounding point, thus, the zero line connected by the zero line connection end can be used as the system reference ground, at this time, in the case that the temperature sensor is damaged due to breakdown, when the reference ground of the temperature sensor is short-circuited with the metal shell of the household appliance through the liquid, there is no large voltage difference between the metal shell of the household appliance and the ground, thus, the risk of electric shock can be reduced.

[0021] Generally, the voltage withstand level of a diode is relatively low, if a single diode is used to rectify the alternating current, the diode is easy to be broken down, and only a diode with a high voltage withstand level can be selected, which will increase the manufacturing cost of the drive control circuit.

[0022] The cooperation of the first diode and the second diode can share the voltage resistance, the voltage resistance grade of the single diode can be reduced, and the risk of diode breakdown can be reduced.

[0023] Meanwhile, the cost of the diode with the higher voltage resistance grade is much higher than that of the diode with the lower voltage resistance grade, and therefore, the manufacturing cost of the driving control circuit can be reduced in the case of using two diodes for rectification.

[0024] It is worth pointing out that in the case of using two diodes with moderate voltage resistance grades, the manufacturing cost of the driving control circuit can be reduced, and the voltage resistance grade of the diode can be improved, and the reliability of the driving control circuit can be improved.

[0025] In the above technical solution, the first electrolytic capacitor is connected with the cathode of the first diode and the anode of the second diode, at this time, the alternating current rectified by the first diode can form a stable voltage on the first electrolytic capacitor, and in the case of supplying power to the switching power supply through the first electrolytic capacitor, the switching power supply can be provided with more stable power supply, so as to ensure the stable output of the switching power supply.

[0026] In the above technical solution, the first diode and the second diode can allow the signal of the positive half cycle of the alternating current to pass through, and filter out the signal of the negative half cycle of the alternating current.

[0027] In some technical solutions, optionally, the half-wave rectifier circuit further comprises: a first filter capacitor, the first filter capacitor is connected with the first electrolytic capacitor in parallel.

[0028] In the technical solution, there may be beat-shaped interference on the input end side of the half-wave rectifier circuit, and the above interference may cause the voltage fluctuation on the first electrolytic capacitor, and then affect the stability of the switching power supply.

[0029] The first filter capacitor can filter out the interference on the alternating current grid side, so as to improve the stability of the driving control circuit.

[0030] In some technical solutions, optionally, the driving control circuit further comprises: an electric reactor, which is arranged between the first input end of the half-wave rectifier circuit and the live wire connection end, and between the second input end of the half-wave rectifier circuit and the zero line connection end; wherein the first end of the electric reactor is connected with the live wire connection end, the second end of the electric reactor is connected with the first input end of the half-wave rectifier circuit, the third end of the electric reactor is connected with the second input end of the half-wave rectifier circuit, and the fourth end of the electric reactor is connected with the zero line connection end.

[0031] In the technical scheme, the electric reactor is arranged to filter the noise from the AC power grid side, and the noise filtered from the AC power grid side can be provided to the half-wave rectifier circuit to improve the stability of the pulsating DC current after rectification.

[0032] In addition, the electric reactor is arranged to filter the noise from the half-wave rectifier circuit side to the AC power grid.

[0033] In some technical schemes, the drive control circuit further comprises a second filter capacitor, a first end of the second filter capacitor is connected with the live wire connection end, and a second end of the second filter capacitor is connected with the zero line connection end.

[0034] In the technical scheme, the second filter capacitor is arranged to eliminate the differential mode interference by using the second filter capacitor, and in the process, the power supply quality of the AC power input to the half-wave rectifier circuit can be improved, so that the switch power supply is provided with less interference power supply, thereby ensuring the stable operation of the temperature sensor.

[0035] In the above technical scheme, the capacitance value of the second filter capacitor can be valued according to actual use needs, and the specific value is not described here.

[0036] In some technical schemes, the drive control circuit further comprises a third filter capacitor, a first end of the third filter capacitor is connected with the second end of the electric reactor, and a second end of the third filter capacitor is connected with a third grounding point; and a fourth filter capacitor, a first end of the fourth filter capacitor is connected with the third end of the electric reactor, and a second end of the fourth filter capacitor is connected with the third grounding point; wherein the third grounding point is a grounding point connected with the ground.

[0037] In the technical scheme, the third filter capacitor and the fourth filter capacitor are arranged to be connected with the second end of the electric reactor and the third end of the electric reactor respectively, and the second end of the electric reactor and the third end of the electric reactor are used to be connected with the first input end of the half-wave rectifier circuit and the second input end of the half-wave rectifier circuit, so that the third filter capacitor and the fourth filter capacitor can be used to filter the common mode interference at the first input end of the half-wave rectifier circuit and the second input end of the half-wave rectifier circuit, and in the process, the power supply quality of the AC power input to the half-wave rectifier circuit can be improved, so that the switch power supply is provided with less interference power supply, thereby ensuring the stable operation of the temperature sensor.

[0038] In the above technical scheme, the capacitance values of the third filter capacitor and the fourth filter capacitor can be valued according to actual use needs, and the specific value is not described here.

[0039] In some embodiments, the switching power supply comprises a transformer, a first end of a first primary coil of the transformer is connected with a first output end of the half-wave rectifier circuit, a first end of a first secondary coil of the transformer is connected with a first end of the temperature sensor, and a second end of the first secondary coil is connected with the second grounding point; and a first switch tube, a first end of the first switch tube is connected with a second end of the first primary coil, and a second end of the first switch tube is connected with the first grounding point.

[0040] In the embodiments, the switching power supply comprises a transformer and a first switch tube, the first switch tube is arranged in a loop in which the first primary coil is arranged, so that whether the loop in which the first primary coil is arranged is connected or not can be controlled by the first switch tube, and in the process, the on-off frequency of the first switch tube can be controlled according to actual power supply needs, so as to provide power supply adapted to the temperature sensor.

[0041] In the process, the switching power supply can provide corresponding power supply according to actual use needs, so as to meet the working needs of different devices.

[0042] In the embodiments, the transformer is used to realize voltage transformation, so that the first primary coil side and the first secondary coil side can be isolated, thereby improving power supply safety.

[0043] In the embodiments, the second end of the first switch tube is connected with the first grounding point, that is, the second end of the first switch tube and the half-wave rectifier circuit are connected to the same grounding point.

[0044] In some embodiments, the switching power supply further comprises a third diode, which is arranged between the first end of the first secondary coil and the first end of the temperature sensor, an anode of the third diode is connected with the first end of the first secondary coil, and a cathode of the third diode is connected with the first end of the temperature sensor.

[0045] In the embodiments, the third diode is arranged to limit the current flow direction of the first secondary coil, obviously, the transformer can only supply power from the first primary coil to the first secondary coil, but cannot supply power from the first secondary coil to the first primary coil, thereby ensuring that the switching power supply can provide stable power supply to the temperature sensor.

[0046] In some embodiments, the driving control circuit further comprises a driving chip, a power supply end of the driving chip is connected with a first end of a second primary coil of the transformer, and a grounding end of the driving chip is connected with the first grounding point; a micro control unit, a first connection end of the micro control unit is connected with a first connection end of the driving chip, a second connection end of the micro control unit is connected with a second connection end of the driving chip, a signal connection end of the micro control unit is connected with the first end of the temperature sensor, a grounding end of the micro control unit is connected with the second grounding point, and a power supply end of the micro control unit is connected with the third end of the switching power supply.

[0047] In the technical scheme, the driving chip is connected with the micro control unit, so that the driving chip can communicate with the micro control unit, and since the power supply end of the driving chip is connected with the first end of the second primary coil of the transformer, the driving chip can take power from the second primary coil of the transformer, thereby realizing the power-on operation of itself.

[0048] For the second primary coil of the transformer, it is located on one side of the primary coil of the transformer, like the first primary coil of the transformer, so it shares the first grounding point.

[0049] As for the micro control unit, it is connected with the third end of the switching power supply while communicating with the driving chip, at this time, the micro control unit is powered through the third end of the switching power supply, since the grounding end of the micro control unit is connected with the second grounding point, and the micro control unit is connected with the first end of the temperature sensor, so the micro control unit and the temperature sensor can keep the same grounding point, in this process, the transformer is used to isolate the grounding point, while ensuring that the temperature sensor and the micro control unit use the same second grounding point, the power supply isolation is realized, thereby reducing the risk of leakage of the driving control circuit.

[0050] In some technical schemes, optionally, the driving control circuit further comprises: a first resistor connected in series between the signal connection end of the micro control unit and the first end of the temperature sensor; a first capacitor, the first end of the first capacitor is connected with the signal connection end of the micro control unit, and the second end of the first capacitor is connected with the second grounding point.

[0051] In the technical scheme, the first resistor and the first capacitor are set to form an RC circuit, and the formed RC circuit is used for filtering.

[0052] Specifically, the signal output by the temperature sensor is a low-frequency signal, and when the signal is transmitted or interfered by an external interference, a high-frequency interference is formed between the first end of the temperature sensor and the micro control unit, which affects the operation of the micro control unit.

[0053] By setting the RC circuit composed of the first capacitor and the first resistor, the above high-frequency interference can be filtered out, thereby serving as a low-pass filter circuit to improve the reliability of the driving control circuit.

[0054] In some technical schemes, optionally, the driving control circuit further comprises: a second resistor connected in series between the first end of the temperature sensor and the third end of the switching power supply.

[0055] In the technical solution, the second resistor is arranged to limit the current flowing through the first end of the temperature sensor, so that the working circuit of the temperature sensor is reduced, the probability of damage of the temperature sensor due to overcurrent is reduced, and the reliability of the drive control circuit is improved.

[0056] In the above technical solution, the resistance value of the second resistor can be selected according to actual use needs, and the specific value is not described here.

[0057] In some technical solutions, the drive control circuit further comprises a frequency conversion circuit, a first input end of the frequency conversion circuit is connected with the first output end of the half-wave rectifier circuit, and a second input end of the frequency conversion circuit is connected with the second output end of the half-wave rectifier circuit.

[0058] In the technical solution, the drive control circuit further comprises a frequency conversion circuit and a motor, and the frequency conversion circuit is connected between the half-wave rectifier circuit and the motor, so that the frequency conversion circuit can be used to realize frequency conversion driving of the motor, and in this process, the motor can ensure the required power output, thereby meeting the power requirements of the motor in different scenarios.

[0059] According to the second aspect of the present application, the present application provides a household appliance, comprising: the drive control circuit of any one of the first aspect.

[0060] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0061] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0062] Figure 1 Part of the topology schematic diagram of the drive control circuit in the related technical solution is shown;

[0063] Figure 2 One of the topology schematic diagrams of the drive control circuit in the embodiments of the present application is shown;

[0064] Figure 3 The second of the topology schematic diagrams of the drive control circuit in the embodiments of the present application is shown;

[0065] Figure 4 The structure schematic diagram of the dishwasher in the embodiments of the present application is shown;

[0066] Figure 5The connection schematic diagram of the first grounding point and the second grounding point in the embodiment of the utility model is shown.

[0067] Figure 6 The connection schematic diagram of the power distribution box in the embodiment of the utility model is shown.

[0068] Figure 7 The topology schematic diagram of rectifying alternating current by using a half-wave rectifier circuit in the embodiment of the utility model is shown.

[0069] Figure 8 The schematic diagram of input and output signals when rectifying alternating current by using a full-wave rectifier circuit is shown.

[0070] Figure 9 The schematic diagram of input and output signals when rectifying alternating current by using a half-wave rectifier circuit in the embodiment of the utility model is shown.

[0071] Wherein, Figure 1 The correspondence between the reference signs and the component names in the drawings is as follows:

[0072] D1' is a first diode, D2' is a second diode, D3' is a third diode, and D4' is a fourth diode.

[0073] Wherein, Figures 2 to 7 The correspondence between the reference signs and the component names in the drawings is as follows:

[0074] 100 driving control circuit, 102 live wire connection end, 104 zero line connection end, 106 half-wave rectifier circuit, 108 switching power supply, 110 temperature sensor, PGND first grounding point, GND second grounding point, D1 first diode, EC1 first electrolytic capacitor, D2 second diode, GC1 first filter capacitor, L1 reactor, GC2 second filter capacitor, GC3 third filter capacitor, GC4 fourth filter capacitor, PE third grounding point, T transformer, Q1 first switch tube, D3 third diode, 112 driving chip, 114 micro control unit, R1 first resistor, C1 first capacitor, R2 second resistor, 116 frequency conversion circuit, M motor, 300 dish washing machine, 301 metal shell, 302 metal inner container, 303 upper spray arm, 304 lower spray arm, 305 water inlet pipe, 306 water inlet valve, 307 water cup, 308 circulating pump, 309 drain pump, 310 power supply line, 311 water faucet, 500 power distribution box, 502 electrical equipment. DETAILED DESCRIPTION

[0075] In order to enable the above aspects, features and advantages of the utility model to be more clearly understood, the utility model will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0076] In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can be practiced in other ways different from those described herein, therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0077] In one embodiment of the present application, as shown in Figure 2 and Figure 3 , a driving control circuit 100 is provided, comprising: a live wire connection end 102; a zero wire connection end 104; a half-wave rectifier circuit 106, a first input end of the half-wave rectifier circuit 106 is connected with the live wire connection end 102, a second input end of the half-wave rectifier circuit 106 is connected with the zero wire connection end 104, a second output end of the half-wave rectifier circuit 106 is connected with a first grounding point PGND; a switching power supply 108, a first end of the switching power supply 108 is connected with a first output end of the half-wave rectifier circuit 106, a second end of the switching power supply 108 is connected with the first grounding point PGND, a fourth end of the switching power supply 108 is connected with a second grounding point GND; a temperature sensor 110, a first end of the temperature sensor 110 is connected with a third end of the switching power supply 108, a second end of the temperature sensor 110 is connected with the second grounding point GND; wherein, the first grounding point PGND is a grounding point directly or indirectly connected with an alternating current network, the second grounding point GND is a grounding point not directly or indirectly connected with the alternating current network.

[0078] The present application provides a driving control circuit 100, in the driving control circuit 100, the live wire connection end 102, the zero wire connection end 104 and the switching power supply 108 are connected by the half-wave rectifier circuit 106, so that the first grounding point PGND connected with the half-wave rectifier circuit 106 and the zero wire connection end 104 can be directly or indirectly connected. In this process, the zero wire connected with the zero wire connection end 104 can be used as the system reference ground, at this time, when the temperature sensor 110 is damaged by breakdown, the reference ground of the temperature sensor 110 will be short-circuited with the metal shell of the household appliance through the liquid, and there is no large voltage difference between the metal shell of the household appliance and the ground, so that the risk of electric shock can be reduced.

[0079] In the above embodiment, the live wire connection end 102 can be understood as a connection end for connecting the live wire, at the same time, the zero wire connection end 104 can be understood as a connection end for connecting the zero wire, the live wire connection end 102 and the zero wire connection end 104 can be connected with the live wire and the zero wire, and then the half-wave rectifier circuit 106 is connected with the alternating current network, so that the alternating current is taken from the alternating current network for the driving control circuit 100.

[0080] In the above embodiment, the switching power supply 108 can be understood as a power supply that can control whether to output power supply, in the utility model, the switching power supply 108 can be used to take power from the half-wave rectifier circuit 106, and supply power to the temperature sensor 110.

[0081] In the above embodiment, the first grounding point PGND refers to the area directly or indirectly connected with the AC power grid, which can also be called hot ground, and there is a voltage difference between the hot ground and the ground, so there is a risk of electric shock if a person stands on the ground directly.

[0082] In the above embodiment, the second grounding point GND refers to the ground that is not connected with the AC power grid, which is isolated from the human body by the transformer T or components, or only exists in a local loop, and generally does not pose a danger to the human body, which can also be called cold ground.

[0083] In some embodiments, optionally, the half-wave rectifier circuit 106 includes: a first diode D1, an anode of the first diode D1 is connected with the live wire connection end 102; a first electrolytic capacitor EC1, a first end of the first electrolytic capacitor EC1 is connected with a cathode of the first diode D1 and a first end of the switching power supply 108 respectively, and a second end of the first electrolytic capacitor EC1 is connected with the neutral wire connection end 104 and the first grounding point PGND respectively.

[0084] In this embodiment, the half-wave rectifier circuit 106 includes the first diode D1 and the first electrolytic capacitor EC1, wherein the first diode D1 is arranged between the live wire connection end 102 and the first end of the switching power supply 108, so as to limit the signal of the negative half cycle of the alternating current provided by the AC power grid to pass through, at this time, the neutral wire connection end 104 can be directly connected with the first grounding point PGND, so that the neutral wire connected by the neutral wire connection end 104 can be used as the system reference ground, at this time, when the temperature sensor 110 is damaged due to breakdown, the reference ground of the temperature sensor 110 will be short-circuited with the metal shell of the household appliance through the liquid, and there is no large voltage difference between the metal shell of the household appliance and the ground, so the risk of electric shock can be reduced.

[0085] In the above embodiment, the first electrolytic capacitor EC1 is connected with the cathode of the first diode D1 and the first grounding point PGND respectively, at this time, the alternating current rectified by the first diode D1 can form a stable voltage on the first electrolytic capacitor EC1, and in the case of supplying power to the switching power supply 108 through the first electrolytic capacitor EC1, the switching power supply 108 can be provided with more stable power supply, so as to ensure that the switching power supply 108 stably outputs power supply.

[0086] In the above embodiment, the first diode D1 can allow the signal of the positive half cycle of the alternating current to pass through, and filter out the signal of the negative half cycle of the alternating current.

[0087] In some embodiments, optionally, the half-wave rectification circuit 106 comprises: a first diode D1, an anode of the first diode D1 is connected with the live wire connection end 102, and a cathode of the first diode D1 is connected with a first end of the switching power supply 108; a second diode D2, a cathode of the second diode D2 is connected with the zero wire connection end 104, and an anode of the second diode D2 is connected with the first grounding point PGND; and a first electrolytic capacitor EC1, a first end of the first electrolytic capacitor EC1 is connected with the cathode of the first diode D1, and a second end of the first electrolytic capacitor EC1 is connected with the anode of the second diode D2.

[0088] In this embodiment, the half-wave rectification circuit 106 comprises the first diode D1, the second diode D2 and the first electrolytic capacitor EC1, wherein the first diode D1 and the second diode D2 can be used in cooperation to limit the signal of the negative half cycle of the alternating current provided by the alternating current grid to pass, at this time, the zero wire connection end 104 can be indirectly connected with the first grounding point PGND directly, thus, the zero wire connected with the zero wire connection end 104 can be used as the system reference ground, at this time, when the temperature sensor 110 is damaged due to breakdown, the reference ground of the temperature sensor 110 can be short-circuited with the metal shell of the household appliance through the liquid, and there is no large voltage difference between the metal shell of the household appliance and the ground, thus, the risk of electric shock can be reduced.

[0089] Generally, the voltage withstand level of a diode is relatively low, and when a single diode is used for rectification, the diode is easy to be broken down, and only a diode with a high voltage withstand level can be selected, which will increase the manufacturing cost of the drive control circuit 100.

[0090] In the embodiment of the utility model, the first diode D1 and the second diode D2 are used in cooperation to share the voltage withstand, the voltage withstand level of a single diode can be reduced, and the risk of diode breakdown can be reduced.

[0091] Meanwhile, the cost of a diode with a high voltage withstand level is much higher than that of a diode with a low voltage withstand level, thus, when two diodes are used for rectification, the manufacturing cost of the drive control circuit 100 can be reduced.

[0092] It is worth pointing out that when two diodes with a moderate voltage withstand level are selected and used in cooperation, the manufacturing cost of the drive control circuit 100 can be reduced, and the voltage withstand level of the diode can be improved, and the reliability of the drive control circuit 100 can be improved.

[0093] In the above embodiment, the first electrolytic capacitor EC1 is connected to the cathode of the first diode D1 and the anode of the second diode D2, respectively. At this time, the alternating current rectified by the first diode D1 can form a stable voltage on the first electrolytic capacitor EC1. In the case of supplying power to the switching power supply 108 through the first electrolytic capacitor EC1, more stable power supply can be provided to the switching power supply 108, so as to ensure the stable output of the switching power supply 108.

[0094] In the above embodiment, the first diode D1 and the second diode D2 can allow the signal of the positive half cycle of the alternating current to pass through, and filter out the signal of the negative half cycle of the alternating current.

[0095] In some embodiments, optionally, the half-wave rectification circuit 106 further comprises a first filter capacitor GC1, and the first filter capacitor GC1 is connected in parallel with the first electrolytic capacitor EC1.

[0096] In this embodiment, there may be a beat-shaped interference on the input side of the half-wave rectification circuit 106. The above interference can cause the voltage on the first electrolytic capacitor EC1 to fluctuate, thereby affecting the stability of the switching power supply 108.

[0097] The first filter capacitor GC1 can filter out the interference on the alternating current grid side, so as to improve the stability of the driving control circuit 100.

[0098] In some embodiments, optionally, the driving control circuit 100 further comprises an inductor L1, which is arranged between the first input end of the half-wave rectification circuit 106 and the live wire connection end 102, and between the second input end of the half-wave rectification circuit 106 and the zero line connection end 104. The first end of the inductor L1 is connected to the live wire connection end 102, the second end of the inductor L1 is connected to the first input end of the half-wave rectification circuit 106, the third end of the inductor L1 is connected to the second input end of the half-wave rectification circuit 106, and the fourth end of the inductor L1 is connected to the zero line connection end 104.

[0099] In this embodiment, the inductor L1 can filter out the noise from the alternating current grid side. By filtering out the noise from the alternating current grid side, the alternating current filtered of noise can be provided to the half-wave rectification circuit 106, so as to improve the stability of the pulsating direct current after rectification.

[0100] In addition, the inductor L1 can also filter out the noise from the half-wave rectification circuit 106 side to the alternating current grid.

[0101] In some embodiments, optionally, the driving control circuit 100 further comprises a second filter capacitor GC2, and the first end of the second filter capacitor GC2 is connected to the live wire connection end 102, and the second end of the second filter capacitor GC2 is connected to the zero line connection end 104.

[0102] In this embodiment, by setting the second filter capacitor GC2, the second filter capacitor GC2 is used to eliminate the differential mode interference, in the process, the power supply quality of the alternating current input to the half-wave rectifier circuit 106 can be improved, so as to provide less interference power supply for the switching power supply 108, so as to ensure the stable work of the temperature sensor 110.

[0103] In the above embodiment, the capacitance value of the second filter capacitor GC2 can be valued according to the actual use, and the specific value is not described here.

[0104] In some embodiments, optionally, the drive control circuit 100 further comprises: a third filter capacitor GC3, a first end of the third filter capacitor GC3 is connected with the second end of the reactor L1, and a second end of the third filter capacitor GC3 is connected with the third grounding point PE; a fourth filter capacitor GC4, a first end of the fourth filter capacitor GC4 is connected with the third end of the reactor L1, and a second end of the fourth filter capacitor GC4 is connected with the third grounding point PE; wherein the third grounding point PE is a grounding point connected with the ground.

[0105] In this embodiment, the third filter capacitor GC3 and the fourth filter capacitor GC4 are respectively connected with the second end of the reactor L1 and the third end of the reactor L1, and the second end of the reactor L1 and the third end of the reactor L1 are used to be connected with the first input end of the half-wave rectifier circuit 106 and the second input end of the half-wave rectifier circuit 106, therefore, the third filter capacitor GC3 and the fourth filter capacitor GC4 can be used to filter the common mode interference at the first input end of the half-wave rectifier circuit 106 and the second input end of the half-wave rectifier circuit 106, in the process, the power supply quality of the alternating current input to the half-wave rectifier circuit 106 can be improved, so as to provide less interference power supply for the switching power supply 108, so as to ensure the stable work of the temperature sensor 110.

[0106] In the above embodiment, the capacitance value of the third filter capacitor GC3 and the fourth filter capacitor GC4 can be valued according to the actual use, and the specific value is not described here.

[0107] In some embodiments, optionally, the switching power supply 108 comprises: a transformer T, a first end of a first primary coil of the transformer T is connected with the first output end of the half-wave rectifier circuit 106, a first end of a first secondary coil of the transformer T is connected with the first end of the temperature sensor 110, and a second end of the first secondary coil is connected with a second grounding point GND; a first switch tube Q1, a first end of the first switch tube Q1 is connected with a second end of the first primary coil, and a second end of the first switch tube Q1 is connected with a first grounding point PGND.

[0108] In the embodiment, the switching power supply 108 comprises the transformer T and the first switch tube Q1, wherein the first switch tube Q1 is arranged in the loop where the first primary coil is located, thus the loop where the first primary coil is located can be controlled to be connected or not by the first switch tube Q1, in the process, the first switch tube Q1 can be controlled by the actual power supply requirement to control the on-off frequency, and then the temperature sensor 110 is provided with the power supply adapted to it.

[0109] In the process, the switching power supply 108 can provide corresponding power supply according to the actual use requirement, so as to meet the working requirement of different devices.

[0110] In the above embodiment, the transformer T is used to realize the transformation of voltage, and the first primary coil side can be isolated from the first secondary coil side, so as to improve the safety of power supply.

[0111] In the above embodiment, the second end of the first switch tube Q1 is connected with the first grounding point PGND, that is, the second end of the first switch tube Q1 and the half-wave rectifier circuit 106 are connected to the same grounding point.

[0112] In some embodiments, optionally, the switching power supply 108 further comprises a third diode D3 located between the first end of the first secondary coil and the first end of the temperature sensor 110, the anode of the third diode D3 is connected with the first end of the first secondary coil, and the cathode of the third diode D3 is connected with the first end of the temperature sensor 110.

[0113] In the embodiment, the third diode D3 arranged can limit the current flow direction of the first secondary coil, obviously, the transformer T can only supply power from the first primary coil to the first secondary coil, but cannot supply power from the first secondary coil to the first primary coil, so as to ensure that the switching power supply 108 can provide stable power supply to the temperature sensor 110.

[0114] In some embodiments, optionally, the driving control circuit 100 further comprises a driving chip 112, the power supply end of the driving chip 112 is connected with the first end of the second primary coil of the transformer T, and the grounding end of the driving chip 112 is connected with the first grounding point PGND; a micro control unit 114, the first connection end of the micro control unit 114 is connected with the first connection end of the driving chip 112, the second connection end of the micro control unit 114 is connected with the second connection end of the driving chip 112, the signal connection end of the micro control unit 114 is connected with the first end of the temperature sensor 110, the grounding end of the micro control unit 114 is connected with the second grounding point GND, and the power supply end of the micro control unit 114 is connected with the third end of the switching power supply 108.

[0115] In this embodiment, the driving chip 112 is connected with the micro control unit 114, so that the driving chip 112 can communicate with the micro control unit 114. Since the power supply end of the driving chip 112 is connected with the first end of the second primary coil of the transformer T, the driving chip 112 can take power from the second primary coil of the transformer T, and thus realize the power-on operation of itself.

[0116] For the second primary coil of the transformer T, it is located on one side of the primary coil of the transformer T, and thus shares the first grounding point PGND.

[0117] For the micro control unit 114, it is connected with the third end of the switching power supply 108 while communicating with the driving chip 112. At this time, the micro control unit 114 is powered through the third end of the switching power supply 108. Since the grounding end of the micro control unit 114 is connected with the second grounding point GND, and the micro control unit 114 is connected with the first end of the temperature sensor 110, the micro control unit 114 and the temperature sensor 110 can keep the same grounding point. In this process, the transformer T is used to isolate the grounding points. While ensuring that the temperature sensor 110 and the micro control unit 114 adopt the same second grounding point GND, the power supply isolation is realized, so as to reduce the risk of electric leakage of the driving control circuit 100.

[0118] In some embodiments, optionally, the driving control circuit 100 further comprises: a first resistor R1 connected in series between the signal connection end of the micro control unit 114 and the first end of the temperature sensor 110; and a first capacitor C1, a first end of the first capacitor C1 being connected with the signal connection end of the micro control unit 114, and a second end of the first capacitor C1 being connected with the second grounding point GND.

[0119] In this embodiment, the first resistor R1 and the first capacitor C1 constitute an RC circuit, and the RC circuit is used for filtering.

[0120] Specifically, the signal output by the temperature sensor 110 is a low-frequency signal. When the signal is transmitted or interfered by external interference, high-frequency interference is formed between the first end of the temperature sensor 110 and the micro control unit 114, which affects the operation of the micro control unit 114.

[0121] By setting the RC circuit composed of the first capacitor C1 and the first resistor R1, the above-mentioned high-frequency interference can be filtered out, and the RC circuit is used as a low-pass filter circuit, so as to improve the reliability of the driving control circuit 100.

[0122] In some embodiments, optionally, the drive control circuit 100 further comprises: a second resistor R2, which is connected in series between the first end of the temperature sensor 110 and the third end of the switching power supply 108.

[0123] In this embodiment, by setting the second resistor R2, the current flowing through the first end of the temperature sensor 110 is limited by the second resistor R2, in the process, the working circuit of the temperature sensor 110 can be reduced, the probability of damage of the temperature sensor 110 due to overcurrent is reduced, thereby improving the reliability of the drive control circuit 100.

[0124] In the above embodiment, the resistance value of the second resistor R2 can be valued according to the actual use, and the specific value is not described here.

[0125] In some embodiments, optionally, the drive control circuit 100 further comprises: a frequency conversion circuit 116, a first input end of the frequency conversion circuit 116 is connected with a first output end of the half-wave rectifier circuit 106, and a second input end of the frequency conversion circuit 116 is connected with a second output end of the half-wave rectifier circuit 106; and a motor M, a first input end of the motor M is connected with a first output end of the frequency conversion circuit 116, and a second input end of the motor M is connected with a second output end of the frequency conversion circuit 116.

[0126] In this embodiment, the drive control circuit 100 further comprises a frequency conversion circuit 116 and a motor M, since the frequency conversion circuit 116 is connected between the half-wave rectifier circuit 106 and the motor M, the frequency conversion circuit 116 can be used to realize the frequency conversion driving of the motor M, in the process, it can be ensured that the motor M can output the required power, thereby meeting the power demand of the motor M in different scenarios.

[0127] In some embodiments of the utility model, the utility model provides a kind of household appliance, comprising: the drive control circuit 100 of any one in the above.

[0128] Specifically, the utility model provides a kind of household appliance comprising drive control circuit 100, in the drive control circuit 100, utilize half-wave rectifier circuit 106 to connect live wire connection end 102, zero line connection end 104 and switching power supply 108, so that the first grounding point PGND connected by half-wave rectifier circuit 106 can be directly or indirectly connected between zero line connection end 104.In the process, zero line connected by zero line connection end 104 can be used as system reference ground, at this time, when temperature sensor 110 breakdown and damage, the reference ground of temperature sensor 110 will be short-circuited with the metal shell of household appliance by liquid, and there is no large voltage difference between the metal shell of household appliance and ground, so the risk of electric shock can be reduced.

[0129] In the above embodiment, the live wire connecting end 102 can be understood as a connecting end for connecting a live wire, and at the same time, the zero wire connecting end 104 can be understood as a connecting end for connecting a zero wire, the live wire connecting end 102 and the zero wire connecting end 104 arranged can connect the live wire and the zero wire, and then connect the half-wave rectifier circuit 106 with the alternating current power grid, so as to take alternating current from the alternating current power grid for the driving control circuit 100 to use.

[0130] In the above embodiment, the switching power supply 108 can be understood as a power supply which can control whether to output power supply, in the utility model, the switching power supply 108 can be used to take power from the half-wave rectifier circuit 106 and supply power to the temperature sensor 110.

[0131] In the above embodiment, the first grounding point PGND refers to an area directly or indirectly connected with the alternating current power grid, which can also be called hot ground, and there is a voltage difference between the hot ground and the ground, so if a human body stands on the ground and directly triggers, there is a risk of electric shock.

[0132] In the above embodiment, the second grounding point GND refers to a ground without connection with the alternating current power grid, which is isolated from the human body by the transformer T or components, or only exists in a local loop, and generally does not pose a danger to the human body, which can also be called cold ground.

[0133] In some embodiments of the utility model, the household appliance is a dishwasher, as shown in the accompanying drawings, the dishwasher 300 includes a metal shell 301, a metal inner container 302, an upper spray arm 303, a lower spray arm 304, a water inlet pipe 305, a water inlet valve 306, a water cup 307, a circulating pump 308, a drain pump 309, a power cord 310 and a water faucet 311. Figure 4

[0134] Among them, the water faucet 311 stores water after water inlet, and the water cup 307 has water, because the temperature sensor 110 in the water cup 307 is immersed in water for a long time to detect water temperature, specifically, the temperature sensor 110 has two lead wires, one of which is a reference ground, that is, the second grounding point in the utility model. When the temperature sensor 110 is broken, its reference ground will be directly connected with the metal inner container 302 of the dishwasher 300 through the water in the water cup 307, and the metal inner container 302 and the metal shell 301 inside are directly connected together, belonging to the same conductor.

[0135] And the power cord 310 of the dishwasher 300 generally adopts single-phase three-wire system, one of which is a grounding wire, but some users' sockets do not have real ground or have problems such as poor grounding during use, which will cause the grounding effect to fail, because most household appliances adopt non-isolation scheme, such as Figure 5 ​As shown, the non-isolation scheme, that is, the "hot ground" PGND and the "cold ground" GND are connected through a 0Ω resistor, belong to one ground, and do not play an isolation protection role.

[0136] The "hot ground" is the bus ground after full-wave rectification, is indirectly connected with the alternating current, and there is a voltage difference between the hot ground and the ground.

[0137] Figure 6 As shown, the connection between the zero line, the fire line and the ground line in the distribution box and the electric equipment is as shown in the connection diagram of the distribution box. Figure 6 As shown, the zero line N, the fire line L and the ground line in the distribution box 500 are connected with the electric equipment 502, wherein the electric equipment 502 can be the household appliance mentioned in the utility model, and the zero line N is connected with the ground line and then connected to the ground.

[0138] Figure 7 As shown, the topology diagram of the half-wave rectification circuit for rectifying the alternating current in the embodiment of the utility model is shown. Figure 8 As shown, the input and output signal diagram when the full-wave rectification circuit is used to rectify the alternating current is shown. Figure 9 As shown, the input and output signal diagram when the half-wave rectification circuit is used to rectify the alternating current in the embodiment of the utility model is shown.

[0139] As shown in Figure 7 , Figure 8 and Figure 9 , the full-wave rectification is to pass the alternating voltage on the zero fire line through four rectifier diodes or rectifier bridges, full-wave rectify the alternating voltage into direct current, and then filter through the bus capacitor. Since the bus ground after full-wave rectification is the hot ground, is indirectly connected with the alternating current grid, and there is a voltage difference between the hot ground and the real ground, sometimes the voltage difference is greater than the human body safety voltage 36V.

[0140] The reference ground hot ground and the cold ground of the common electric control board of the dishwasher 300 are the same ground, are often directly connected together, or are connected through a 0Ω resistor single-point grounding, and there is a large voltage difference problem between the cold ground and the ground.

[0141] Due to the special function of the dishwasher 300, there is a water cup 307 for storing water in the water inlet system, and a temperature sensor 110 exists in the water cup 307 for water temperature detection in the system. The reference ground of the temperature sensor 110 is directly short-circuited with the internal metal shell (ground) of the dishwasher through water when breakdown occurs inside the temperature sensor 110. Since the common dishwasher system is a non-isolation scheme, the hot ground and the cold ground are directly connected, and the cold ground also has a voltage difference with the ground, and there is a risk of electric shock if a human body stands on the ground and directly triggers it.

[0142] Because the inside ground wire of the dishwasher 300 is connected to the metal shell 301 of the dishwasher, the shell is grounded, at this time if the shell is well grounded, the leakage current will flow through the ground wire of the shell through the ground, but some power line sockets do not have ground wires, or the ground wire is loose or the ground resistance is too large during long-term use, if the user touches the metal shell of the dishwasher with his hand, there is a risk of electric shock.

[0143] In the embodiment, as shown in Figure 6 The zero line N of the power grid is used as the reference ground of the control panel, that is, GND, by using the half-wave rectifier circuit. Since the neutral point N line of the power grid and the ground wire are directly connected together, there is no large voltage difference between the N line and the ground, and the ideal state voltage difference is 0V. At this time, the ground of the frequency converter and the ground of the main control in the control system of the dishwasher 300 are both taken as the reference ground of the zero line N. When the breakdown short circuit of the temperature sensor 110 occurs, even if the dishwasher power line ground wire is not connected or the ground resistance is too large, since the ground wire of the metal shell and the reference ground of the control panel are equipotential, the voltage difference is 0V, at this time the user standing on the ground directly touches the metal shell of the dishwasher, there is no risk of electric shock.

[0144] Therefore, changing the rectifier circuit from full-wave rectification to half-wave rectification and taking the zero line N of the power grid system as the reference ground of the control system can meet the leakage safety regulations.

[0145] In the above embodiment, the full-wave rectification is changed to half-wave rectification, and the efficiency η of the switching power supply is reduced from about 70% to 48.5%. Therefore, the current and voltage of the rectifier diode and the bus capacitor need to be reselected, as follows:

[0146] (1) Rectifier diode voltage selection:

[0147] When selecting a rectifier diode, the highest working voltage is selected. After adding a filter capacitor, the bus voltage is not much different from that of full-wave rectification, and the voltage fluctuation value is increased.

[0148] (reserve 1.5 times the withstand voltage)

[0149] Therefore, the bus capacitor withstand voltage value and the rectifier diode withstand voltage value are 1.5xVbusmax.

[0150] Wherein, Vbusmax is the voltage at the first output end of the half-wave rectifier circuit (106), and Vacmax is the maximum voltage of the alternating current.

[0151] (2) Rectifier diode current selection:

[0152] Input power: Pint = Pout x working efficiency η (η takes 0.485), the system output power Pout can be calculated according to the maximum load.

[0153] Iacmax = Pint / Vacmin (Vacmin takes 85V) also reserves 1.5 times.

[0154] Wherein, Iacmax is the maximum current of alternating current, Pint is input power, Pout is output power, Vacmin is the minimum voltage of alternating current.

[0155] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more of the features. In the literal description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0156] In the literal description of the present application, it can be understood that, except for the explicit provisions and limitations, the terms "mounting", "connection", "connection" should be interpreted broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanical structure connection, or electrical connection; it can be that the two are directly connected, or the two are indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0157] In the claims, description and drawings of the present application, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the claims, description and drawings of the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0158] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A drive control circuit, characterized by comprising: The application relates to a driving control circuit for a temperature sensor, comprising: a live connection end; a neutral connection end; a half-wave rectification circuit, a first input end of the half-wave rectification circuit being connected with the live connection end, a second input end of the half-wave rectification circuit being connected with the neutral connection end, and a second output end of the half-wave rectification circuit being connected with a first grounding point; a switching power supply, a first end of the switching power supply being connected with a first output end of the half-wave rectification circuit, a second end of the switching power supply being connected with the first grounding point, and a fourth end of the switching power supply being connected with a second grounding point; a temperature sensor, a first end of the temperature sensor being connected with a third end of the switching power supply, and a second end of the temperature sensor being connected with the second grounding point; wherein the first grounding point is a grounding point directly or indirectly connected with an alternating current power grid, and the second grounding point is a grounding point not directly or indirectly connected with the alternating current power grid.

2. The drive control circuit according to claim 1, characterized by The half-wave rectification circuit comprises: a first diode, an anode of the first diode being connected with the live connection end; a first electrolytic capacitor, a first end of the first electrolytic capacitor being connected with a cathode of the first diode and the first end of the switching power supply respectively, and a second end of the first electrolytic capacitor being connected with the neutral connection end and the first grounding point respectively.

3. The drive control circuit according to claim 1, characterized by The half-wave rectification circuit comprises: a first diode, an anode of the first diode being connected with the live connection end, and a cathode of the first diode being connected with the first end of the switching power supply; a second diode, a cathode of the second diode being connected with the neutral connection end, and an anode of the second diode being connected with the first grounding point; a first electrolytic capacitor, a first end of the first electrolytic capacitor being connected with the cathode of the first diode, and a second end of the first electrolytic capacitor being connected with the anode of the second diode.

4. The drive control circuit according to claim 2 or 3, characterized by The half-wave rectification circuit further comprises: a first filter capacitor, the first filter capacitor being connected with the first electrolytic capacitor in parallel.

5. The drive control circuit according to claim 1, characterized by The switching power supply comprises: a transformer, a first end of a first primary coil of the transformer being connected with the first output end of the half-wave rectification circuit, a first end of a first secondary coil of the transformer being connected with the first end of the temperature sensor, and a second end of the first secondary coil being connected with the second grounding point; a first switch tube, a first end of the first switch tube being connected with a second end of the first primary coil, and a second end of the first switch tube being connected with the first grounding point.

6. The drive control circuit according to claim 5, wherein The switching power supply further comprises: a third diode, the third diode being located between the first end of the first secondary coil and the first end of the temperature sensor, an anode of the third diode being connected with the first end of the first secondary coil, and a cathode of the third diode being connected with the first end of the temperature sensor.

7. The drive control circuit according to claim 5, wherein The driving control circuit further comprises: a driving chip, a power supply end of the driving chip being connected with a first end of a second primary coil of the transformer, and a grounding end of the driving chip being connected with the first grounding point. A micro control unit, a first connection end of the micro control unit is connected with the first connection end of the driving chip, a second connection end of the micro control unit is connected with the second connection end of the driving chip, a signal connection end of the micro control unit is connected with the first end of the temperature sensor, a ground end of the micro control unit is connected with the second ground point, and a power supply end of the micro control unit is connected with the third end of the switching power supply.

8. The drive control circuit according to claim 7, characterized by The driving control circuit further comprises: A first resistor, which is connected in series between the signal connection end of the micro control unit and the first end of the temperature sensor; A first capacitor, a first end of the first capacitor is connected with the signal connection end of the micro control unit, and a second end of the first capacitor is connected with the second ground point.

9. The drive control circuit according to claim 7, characterized by The driving control circuit further comprises: A second resistor, which is connected in series between the first end of the temperature sensor and the third end of the switching power supply.

10. The drive control circuit according to claim 7, characterized by The driving control circuit further comprises: A frequency conversion circuit, a first input end of the frequency conversion circuit is connected with the first output end of the half-wave rectification circuit, and a second input end of the frequency conversion circuit is connected with the second output end of the half-wave rectification circuit; A motor, a first input end of the motor is connected with the first output end of the frequency conversion circuit, and a second input end of the motor is connected with the second output end of the frequency conversion circuit.

11. A domestic appliance characterized in that, The driving control circuit comprises: The driving control circuit according to any one of claims 1 to 10.

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