Pulse generation circuit, sterilization device and household appliance

Abstract

The invention discloses a pulse generation circuit, a sterilization device and a household electrical appliance, and the circuit comprises a rectification unit which is connected with an AC power supply and is used for converting an AC power into a first DC power; the voltage conversion unit is respectively connected with the rectification unit and the energy storage unit and is used for converting the first direct current into second direct current and charging the energy storage unit; the pulse generation unit is used for generating pulse voltage based on the voltage at the two ends of the energy storage unit and providing the pulse voltage to a load; the first voltage detection unit is used for detecting voltages at two ends of the energy storage unit; and the control unit is used for controlling the voltage conversion unit to charge the energy storage unit and outputting a target pulse control signal to control the pulse generation unit to generate a pulse voltage when the voltage at the two ends of the energy storage unit reaches the target voltage so as to trigger the load to start. The circuit can reduce the power supply cost of the load.

Description

Technical Field

[0001] The present invention relates to the field of electronic circuits, and in particular to a pulse generating circuit, a sterilizing device and a household appliance. Background Art

[0002] In household appliances, pulsed strong light sterilization technology has good development prospects. This technology can effectively kill bacteria and purify the air through the internal pulse xenon lamp. However, the pulse xenon lamp requires a high-voltage pulse to be triggered, so it cannot be powered by a conventional power supply. In this regard, the relevant technology usually uses a switching power supply with a boost circuit topology to power the pulse xenon lamp. This circuit topology converts AC power into 12V DC power through a switching power supply, and then boosts the 12V DC power to a high-voltage DC power of 250v-300v to supply the pulse generator, so that the pulse generator provides a pulse voltage for the pulse xenon lamp, thereby allowing the pulse xenon lamp to work normally.

[0003] The disadvantage of the circuit topology in the above-mentioned related technology is that the circuit topology needs to use a switching power supply to provide direct current for power supply, which makes the power supply cost of the pulse xenon lamp relatively high. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first purpose of the present invention is to propose a pulse generating circuit, by arranging a voltage conversion unit, an energy storage unit, a first voltage detection unit and a control unit after a rectifier unit, and obtaining the voltage at both ends of the energy storage unit through the control unit, and controlling the voltage conversion unit to charge the energy storage unit through the control unit, when the voltage at both ends of the energy storage unit reaches the target voltage, outputting a target pulse control signal, so that the pulse generating unit generates a pulse voltage, triggering the pulse to start, so that the circuit can realize the power supply to the load without setting a switching power supply, thereby reducing the power supply cost of the load.

[0005] The second object of the present invention is to provide a sterilization device.

[0006] The third object of the present invention is to provide a household appliance.

[0007] To achieve the above-mentioned purpose, a first embodiment of the present invention proposes a pulse generating circuit, comprising: a rectifier unit, the rectifier unit is connected to an AC power supply, and is used to convert the AC power into a first DC power; a voltage conversion unit and an energy storage unit, the voltage conversion unit is respectively connected to the rectifier unit and the energy storage unit, and is used to convert the first DC power into a second DC power to charge the energy storage unit; a pulse generating unit, the pulse generating unit is respectively connected to the energy storage unit and the load, and is used to generate a pulse voltage based on the voltage at both ends of the energy storage unit, and provide it to the load; a first voltage detection unit, and is used to detect the voltage at both ends of the energy storage unit; a control unit, the control unit is respectively connected to the voltage conversion unit, the pulse generating unit and the first voltage detection unit, and is used to control the voltage conversion unit to charge the energy storage unit, and when the voltage at both ends of the energy storage unit reaches the target voltage, outputs a target pulse control signal to control the pulse generating unit to generate a pulse voltage to trigger the load to start.

[0008] According to the pulse generating circuit of the embodiment of the present invention, a voltage conversion unit, an energy storage unit, a first voltage detection unit and a control unit are arranged after the rectifying unit, and the voltage across the energy storage unit is obtained through the control unit, and the voltage conversion unit is controlled by the control unit to charge the energy storage unit. When the voltage across the energy storage unit reaches the target voltage, a target pulse control signal is output to enable the pulse generating unit to generate a pulse voltage and trigger the pulse to start, so that the circuit can realize power supply to the load without setting a switching power supply, thereby reducing the power supply cost of the load.

[0009] According to one embodiment of the present invention, the pulse generating circuit also includes: a second voltage detection unit, used to detect the output voltage of the rectifier unit to obtain the bus voltage; a control unit, also used to determine the target duty cycle of the voltage conversion unit based on the target voltage and the bus voltage, and control the voltage conversion unit according to the target duty cycle and the target switching frequency.

[0010] According to one embodiment of the present invention, the control unit is further configured to gradually increase the target duty cycle before the voltage across the energy storage unit reaches the target voltage, until the voltage across the energy storage unit reaches the target voltage.

[0011] According to an embodiment of the present invention, the control unit is further configured to increase the target switching frequency when the voltage across the energy storage unit does not reach the target voltage and the charging time of the energy storage unit reaches a preset time.

[0012] According to one embodiment of the present invention, the pulse generating circuit also includes: an overcurrent protection unit, which is used to obtain the load current and output a first overcurrent protection signal when the load current reaches a preset current threshold, wherein the energy storage unit is also connected to the load and is used to supply power to the load so that the load can work after it is successfully started; the control unit is also used to reduce the duration of the target pulse control signal when the first overcurrent protection signal is received during the current operation of the load, and control the pulse generating unit to generate a pulse voltage based on the reduced target pulse control signal when the load is triggered to start next time.

[0013] According to one embodiment of the present invention, the overcurrent protection unit is also connected to the voltage conversion unit, and the overcurrent protection unit is further configured to output a second overcurrent protection signal when the load current reaches a preset current threshold to control the voltage conversion unit to stop working.

[0014] According to one embodiment of the present invention, the voltage conversion unit includes: a first switching tube, a first end of the first switching tube is connected to the rectifying unit, and a second end of the first switching tube is connected to the control unit; a first inductor, a first end of the first inductor is connected to the third end of the first switching tube, and a second end of the first inductor is connected to the energy storage unit.

[0015] According to one embodiment of the present invention, the voltage conversion unit further includes: a second switch tube, a first end of the second switch tube is connected to the second end of the first switch tube, the second end of the second switch tube is connected to the control unit, and a third end of the second switch tube is connected to the first ground.

[0016] According to one embodiment of the present invention, the overcurrent protection unit includes: a current sensing resistor, which is connected in series between the energy storage unit and the load, and is used to convert the load current into a voltage signal; a differential amplifier circuit, the input end of the differential amplifier circuit is connected to the current sensing resistor, and is used to differentially amplify the voltage signal to obtain a differential amplified signal; a first comparison circuit, the input end of the first comparison circuit is respectively connected to the differential amplifier circuit and the reference voltage circuit, the output end of the first comparison circuit is connected to the control unit, and is used to output a first overcurrent protection signal when the differential amplified signal is greater than a reference voltage signal corresponding to a preset current threshold provided by the reference voltage circuit; a second comparison circuit, the input end of the second comparison circuit is respectively connected to the differential amplifier circuit and the reference voltage circuit, the output end of the second comparison circuit is connected to the voltage conversion unit, and is used to output a second overcurrent protection signal when the differential amplified signal is greater than the reference voltage signal corresponding to the preset current threshold provided by the reference voltage circuit.

[0017] According to one embodiment of the present invention, the pulse generating unit includes: a first diode, an anode of the first diode is connected to the positive electrode of the energy storage unit and the load respectively; a first capacitor, a first end of the first capacitor is connected to the cathode of the first diode; a transformer, one end of the primary winding of the transformer is connected to the second end of the first capacitor, one end of the secondary winding of the transformer is connected to the trigger end of the load, and the other end of the primary winding of the transformer and the other end of the secondary winding of the transformer are respectively connected to the second ground; a second capacitor, a first end of the second capacitor is connected to the cathode of the first diode; a third switch tube, a first end of the third switch tube is connected to the cathode of the first diode, a second end of the third switch tube is connected to the control unit, and a third end of the third switch tube is connected to the second ground; a second diode, an anode of the second diode is connected to the second end of the second capacitor and the negative electrode of the load respectively, and the cathode of the second diode is connected to the second ground.

[0018] According to one embodiment of the present invention, the pulse generating unit further includes: a third diode, the cathode of the third diode is connected to the second end of the third switch tube, the anode of the third diode is connected to the second ground; and a first resistor, the first resistor is connected in parallel with the third diode.

[0019] According to one embodiment of the present invention, the pulse generating unit further includes: a photoelectric coupler, wherein a first end of the photoelectric coupler is connected to the control unit, a second end of the photoelectric coupler is connected to the first ground, and a third end of the photoelectric coupler is connected to the second end of the third switch tube; a voltage divider circuit, wherein a first end of the voltage divider circuit is connected to the energy storage unit, a second end of the voltage divider circuit is connected to the second ground, and a third end of the voltage divider circuit is connected to the fourth end of the photoelectric coupler.

[0020] According to one embodiment of the present invention, the load is a pulse xenon lamp.

[0021] To achieve the above-mentioned purpose, a second embodiment of the present invention proposes a sterilization device, including: a pulse xenon lamp; and the aforementioned pulse generating circuit, wherein the pulse generating circuit is connected to the pulse xenon lamp and is used to trigger the pulse xenon lamp to start.

[0022] According to the sterilization device of the embodiment of the present invention, the power supply cost of the pulse xenon lamp can be effectively reduced through the aforementioned pulse generating circuit, thereby reducing the cost of the sterilization device.

[0023] To achieve the above-mentioned object, a third aspect of the present invention provides a household appliance, comprising the aforementioned pulse generating circuit, or the aforementioned sterilization device.

[0024] According to the household appliance of the embodiment of the present invention, the power supply cost of the pulse xenon lamp can be effectively reduced through the aforementioned pulse generating circuit or the aforementioned sterilization device, thereby reducing the cost of the household appliance.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a structural schematic diagram of a pulse generating circuit according to an embodiment of the present invention;

[0027] Figure 2 is a structural schematic diagram of a pulse generating circuit according to another embodiment of the present invention;

[0028] Figure 3 A control logic diagram of a pulse generating circuit according to an embodiment of the present invention;

[0029] Figure 4 is a circuit diagram of a voltage conversion unit according to an embodiment of the present invention;

[0030] Figure 5 is a circuit diagram of a voltage conversion unit according to another embodiment of the present invention;

[0031] Figure 6 is a schematic structural diagram of an overcurrent protection unit according to an embodiment of the present invention;

[0032] Figure 7 is a circuit diagram of an overcurrent protection unit according to an embodiment of the present invention;

[0033] Figure 8 is a circuit diagram of a pulse generating unit according to an embodiment of the present invention;

[0034] Fig. 9 A circuit diagram of a pulse generating circuit according to an embodiment of the present invention;

[0035] Fig.10 A schematic diagram of the structure of a sterilization device according to an embodiment of the present invention;

[0036] Figure 11a to Figure 11b Schematic diagram of the structure of household appliances according to some embodiments of the present invention. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0038] The pulse generating circuit, sterilizing device and household appliance provided in the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0039] Figure 1 FIG. 1 is a schematic diagram of a pulse generating circuit according to an embodiment of the present invention. Figure 1 As shown, the pulse generating circuit 100 includes: a rectifying unit 110 , a voltage converting unit 120 , an energy storage unit 130 , a pulse generating unit 140 , a first voltage detecting unit 150 and a control unit 160 .

[0040] Among them, the rectifier unit 110 is connected to the AC power supply AC, and is used to convert the AC power into a first DC power; the voltage conversion unit 120 is respectively connected to the rectifier unit 110 and the energy storage unit 130, and is used to convert the first DC power into a second DC power to charge the energy storage unit 130; the pulse generating unit 140 is respectively connected to the energy storage unit 130 and the load 200, and is used to generate a pulse voltage based on the voltage at both ends of the energy storage unit 130, and provide it to the load 200; the first voltage detection unit 150 is used to detect the voltage at both ends of the energy storage unit 130; the control unit 160 control unit is respectively connected to the voltage conversion unit 120, the pulse generating unit 140 and the first voltage detection unit 150, and is used to control the voltage conversion unit 120 to charge the energy storage unit 130, and when the voltage at both ends of the energy storage unit 130 reaches the target voltage, the target pulse control signal is output to control the pulse generating unit 140 to generate a pulse voltage to trigger the load 200 to start.

[0041] Specifically, the load 200 can be a variety of pulse drive devices, see Figure 1 As shown, the rectifier unit 110 converts the alternating current output by the alternating current power source AC into a first direct current, and then the control unit 160 controls the voltage conversion unit 120 to convert the first direct current into a second direct current to charge the energy storage unit 130. During the charging process, the control unit 160 also detects the voltage at both ends of the energy storage unit 130 in real time through the first voltage detection unit 150. When it is detected that the voltage at both ends reaches the target voltage, the control unit 160 outputs a target pulse control signal to control the pulse generating unit 140 to generate a pulse voltage, triggering the load 200 to start, thereby meeting the power supply demand of the load 200.

[0042] In the related art, when the load 200 requires a pulse voltage drive, it is usually necessary to use a switching power supply combined with a boost circuit to power the load 200. However, since the circuit structure of the switching power supply is relatively complex and the cost is relatively high, the power supply cost of the load 200 is also high. The pulse generating circuit 100 in the embodiment of the present invention only needs to use an alternating current power supply AC to realize the power supply function of the load 200, without using a switching power supply, thereby reducing the power supply cost of the load.

[0043] In the above embodiment, a voltage conversion unit, an energy storage unit, a first voltage detection unit and a control unit are arranged after the rectifier unit, and the voltage across the energy storage unit is obtained by the control unit, and the voltage conversion unit is controlled by the control unit to charge the energy storage unit. When the voltage across the energy storage unit reaches the target voltage, a target pulse control signal is output, so that the pulse generating unit generates a pulse voltage and triggers the pulse to start, so that the circuit can supply power to the load without setting a switching power supply, thereby reducing the power supply cost of the load.

[0044] In some embodiments, reference Figure 2 As shown, the pulse generating circuit 100 also includes: a second voltage detection unit 170, which is used to detect the output voltage of the rectifying unit 110 to obtain the bus voltage; the control unit 160 is also used to determine the target duty cycle of the voltage conversion unit 120 according to the target voltage and the bus voltage, and control the voltage conversion unit 120 according to the target duty cycle and the target switching frequency.

[0045] Furthermore, the control unit 160 is further configured to gradually increase the target duty cycle before the voltage across the energy storage unit 130 reaches the target voltage, until the voltage across the energy storage unit 130 reaches the target voltage.

[0046] Furthermore, the control unit 160 is further configured to increase the target switching frequency when the voltage across the energy storage unit 130 does not reach the target voltage and the charging time of the energy storage unit 130 reaches a preset time.

[0047] Specifically, the control unit 160 can obtain the output voltage of the rectifier unit 110 through the second voltage detection unit 170, and the output voltage is the bus voltage. Then, the control unit 160 can determine the target duty cycle of the voltage conversion unit 120 according to the target voltage and the bus voltage, as shown in the following formula (1):

[0048] D=H_VDD / V_BUS (1)

[0049] Wherein, D is the target duty cycle, H_VDD is the target voltage of the energy storage unit 130, and V_BUS is the bus voltage. After determining the target duty cycle, the control unit 160 can control the voltage conversion unit 120 according to the target duty cycle and the target switching frequency, so that the voltage of the energy storage unit 130 gradually rises to the target voltage, wherein the target switching frequency can be preset.

[0050] At the same time, since the duty cycle of the voltage conversion unit 120 affects the output voltage of the voltage conversion unit 120, and further affects the charging speed of the energy storage unit 130, when the energy storage unit 130 has not risen to the target voltage, the charging speed of the energy storage unit 130 can be accelerated by gradually increasing the target duty cycle, thereby saving charging time, until the voltage across the energy storage unit 130 reaches the target voltage. Subsequently, the control unit 160 can restore the target duty cycle to the initial value (i.e., the target duty cycle calculated according to the above formula (1)) to maintain the output voltage of the voltage conversion unit 120 at the target voltage.

[0051] In addition, since the target switching frequency of the voltage conversion unit 120 will also affect the charging speed of the energy storage unit 130, a slow charging speed may result in the voltage at both ends of the energy storage unit 130 not rising to the target voltage within the preset time, wherein the preset time refers to the maximum charging time of the energy storage unit 130 in the pulse generating circuit 140 allowed by the circuit design. At this time, the control unit 160 can increase the target switching frequency and increase the charging speed of the energy storage unit 130 to ensure that the subsequent charging time of the voltage conversion unit 120 for the energy storage unit 130 is less than the preset time, thereby improving the reliability of the circuit.

[0052] As a specific example, see Figure 3 As shown, after determining the target duty cycle, the control unit 160 can generate the following Figure 3 The PWM signal shown has an adjustable duty cycle and frequency to control the voltage conversion unit 120 to complete the charging process of the energy storage unit 130 within a preset time, so that the voltage across the energy storage unit 130 rises to the target voltage.

[0053] In the above embodiment, a second voltage detection unit is provided in the pulse generating circuit to obtain the bus voltage, and a target duty cycle is determined by a control unit according to the target voltage and the bus voltage, and then the voltage conversion unit is controlled according to the target duty cycle and the target switching frequency, thereby realizing the function of the control unit controlling the voltage conversion unit to charge the voltage at both ends of the energy storage unit until the voltage at both ends reaches the target voltage; at the same time, the control unit can increase the charging rate of the energy storage unit by increasing the target duty cycle and the target switching frequency, thereby ensuring that the voltage at both ends of the energy storage unit is increased to the target voltage within a preset time, thereby improving the reliability of the pulse generating circuit.

[0054] Optionally, the first voltage detection unit 150 and the second voltage detection unit 170 can realize the voltage detection function by a voltage dividing circuit composed of voltage dividing resistors, for example, referring to Figure 4As shown, the first voltage detection unit 150 may include a first voltage-dividing resistor RF1 and a second voltage-dividing resistor RF2, wherein one end of the first voltage-dividing resistor RF1 is connected to the energy storage unit 130, and the other end of the first voltage-dividing resistor RF1 is respectively connected to one end of the second voltage-dividing resistor RF2 and the control unit 160, and the other end of the second voltage-dividing resistor RF2 is connected to the first ground GND; the second voltage detection unit 170 may include a third voltage-dividing resistor RF3 and a fourth voltage-dividing resistor RF4, wherein one end of the third voltage-dividing resistor RF3 is connected to the positive input end of the rectifier unit 110, and the other end of the third voltage-dividing resistor RF3 is respectively connected to the control unit 160 and one end of the fourth voltage-dividing resistor RF4, and the other end of the fourth voltage-dividing resistor RF4 is the first ground GND. The specific principle of the voltage-dividing circuit is not expanded here.

[0055] In some embodiments, reference Figure 2 As shown, the pulse generating circuit 100 also includes: an overcurrent protection unit 180, which is used to obtain the current of the load 200 and output a first overcurrent protection signal when the current of the load 200 reaches a preset current threshold, wherein the energy storage unit 130 is also connected to the load 200, and is used to supply power to the load 200 so that the load 200 can work after it is successfully started; the control unit 160 is also used to reduce the duration of the target pulse control signal when the first overcurrent protection signal is received during the current operation of the load 200, and control the pulse generating unit 140 to generate a pulse voltage based on the reduced target pulse control signal when the load 200 is triggered to start next time.

[0056] Furthermore, the overcurrent protection unit 180 is also connected to the voltage conversion unit 120, and the overcurrent protection unit 180 is also used to output a second overcurrent protection signal when the current of the load 200 reaches a preset current threshold, so as to control the voltage conversion unit 120 to stop working.

[0057] Specifically, when the voltage across the energy storage unit 130 rises to the target voltage, the energy storage unit 130 provides the target voltage to the pulse generating unit 140 and the load 200 at the same time. At this time, the start-up condition of the load 200 is met, and the control unit 160 outputs a high-level pulse to the pulse generating unit 140 as a target pulse control signal. The waveform of the target pulse control signal is as follows: Figure 3As shown, the pulse generating unit 140 generates a pulse voltage to trigger the load 200 to start. When the load 200 starts, the pulse voltage may cause a large pulse current. At the same time, during the operation of the load 200 after starting, the energy storage unit 130 will discharge to the load 200, and a large current will also be generated in the circuit where the load 200 is located. The current will increase as the working time of the load 200 increases. These currents may cause damage to the pulse generating circuit 100 or the load 200. Therefore, it is necessary to set an overcurrent protection unit 180 to avoid overcurrent in the circuit to protect the pulse generating circuit 100 and the load 200. The overcurrent protection signal of the overcurrent protection unit 180 can be as shown. Figure 3 As shown, when the current of the load 200 does not reach the preset current threshold, the overcurrent protection unit 180 outputs a high level to enable the pulse generating circuit 100 to work normally. When the current of the load 200 reaches the preset current threshold, the overcurrent protection unit 180 outputs a low level as a first overcurrent protection signal and a second overcurrent protection signal, wherein the first overcurrent protection signal is transmitted to the control unit 160 so that the control unit 160 reduces the duration of the target pulse control signal. When the load 200 is triggered to start next time, the pulse generating unit 140 is controlled to generate a pulse voltage according to the reduced target pulse control signal, thereby reducing the discharge time of the load 200, thereby reducing The current of the load 200 in the subsequent cycle is used to protect the circuit safety; the second overcurrent protection signal is transmitted to the voltage conversion unit 120 to control the voltage conversion unit 120 to stop charging the energy storage unit 130, so as to prevent the current of the load 200 from continuing to rise, and ensure that the current of the load 200 in the current cycle does not rise again, thereby protecting the circuit safety; after the first overcurrent protection signal and the second overcurrent protection signal are sent out, the current of the load 200 decreases, and when the overcurrent protection unit 180 detects that the current of the load 200 drops below the preset current threshold, the overcurrent protection unit 180 re-outputs a high level to enable the pulse generating circuit 100 to continue to work normally.

[0058] Therefore, by setting an overcurrent protection unit in the circuit, when the load current exceeds the preset current threshold, the first overcurrent protection signal and the second overcurrent protection signal are output to stop the voltage conversion unit from working and reduce the pulse voltage duration of the pulse generating unit in the subsequent cycle, thereby ensuring the safety of the pulse generating circuit and the load in the current cycle and the subsequent cycles, and further improving the reliability of the pulse generating circuit.

[0059] In some embodiments, reference Figure 4As shown, the voltage conversion unit 120 includes: a first switch tube Q1 and a first inductor L1, wherein the first end of the first switch tube Q1 is connected to the rectifying unit 110, and the second end of the first switch tube Q1 is connected to the control unit 160; the first end of the first inductor L1 is connected to the third end of the first switch tube Q1, and the second end of the first inductor L1 is connected to the energy storage unit 130.

[0060] Optionally, the energy storage unit 130 includes an energy storage capacitor CE, a first end of the energy storage capacitor CE is connected to the second end of the first inductor L1 , and a second end of the energy storage capacitor CE is connected to the first ground GND.

[0061] Specifically, refer to Figure 4 As shown, the first switch tube Q1, the first inductor L1 and the energy storage capacitor CE form a BUCK circuit, so that the voltage conversion unit 120 can convert the first DC power into the second DC power to charge the energy storage capacitor CE. The specific principle of the BUCK circuit is not expanded here. At this time, the control unit 160 can generate a PWM signal according to the determined target duty cycle and target switching frequency, and output the PWM signal to the first switch tube Q1 to control the first switch tube Q1 to turn on and off, so that the voltage of the second DC power can be set to the target voltage to charge the energy storage capacitor CE, thereby gradually increasing the voltage of the energy storage unit 130 to the target voltage.

[0062] In some embodiments, reference Figure 5 As shown, the voltage conversion unit 120 also includes: a second switch tube Q2, a first end of the second switch tube Q2 is connected to the second end of the first switch tube Q1, a second end of the second switch tube Q2 is connected to the control unit, and a third end of the second switch tube Q2 is connected to the first ground GND.

[0063] Optionally, the voltage conversion unit 120 further includes a first current limiting resistor RX1 and a second current limiting resistor RX2, wherein the first current limiting resistor RX1 is connected in series between the second end of the first switch tube Q1 and the first end of the second switch tube Q2, and the second current limiting resistor RX2 is connected in series between the second end of the second switch tube Q2 and the control unit 160.

[0064] Specifically, refer to Figure 5As shown, the voltage conversion unit 120 may further include a second switch tube Q2, wherein the first switch tube Q1 is a PNP type triode, the second switch tube may be an NPN type triode, and the second ends of the first switch tube Q1 and the second switch tube Q2 are both bases. When the control unit 160 outputs a high level to the base of the second switch tube Q2, the second switch tube Q2 is turned on, and the first switch tube Q1 is connected to the first ground GND through the second switch tube Q2, thereby turning on the first switch tube Q1, so that the control unit 160 realizes the function of controlling the on and off of the first switch tube Q1. At the same time, the second The switch tube Q2 has a certain isolation function to prevent the voltage of the voltage conversion unit 120 from affecting the control unit 160; in addition, the first current limiting resistor RX1 and the second current limiting resistor RX2 both have a current limiting function, wherein the first current limiting resistor RX1 can limit the current of the circuit where the second end of the first switch tube Q1 is located, thereby reducing the power loss of the circuit where the first switch tube Q1 is located, and the second current limiting resistor RX2 can limit the current of the circuit where the second end of the second switch tube Q2 is located, thereby reducing the power loss of the circuit where the second switch tube Q2 is located, thereby realizing the optimization of the pulse generating circuit.

[0065] In some embodiments, reference Figure 6 As shown, the overcurrent protection unit 180 includes: a current sensing resistor RJ, a differential amplifier circuit 181 , a first comparison circuit 182 and a second comparison circuit 183 . Among them, the current sensing resistor RJ is connected in series between the energy storage unit 130 and the load 200, and is used to convert the current of the load 200 into a voltage signal; the input end of the differential amplifier circuit 181 is connected to the current sensing resistor RJ, and is used to differentially amplify the voltage signal to obtain a differential amplified signal; the input end of the first comparison circuit 182 is respectively connected to the differential amplifier circuit 181 and the reference voltage circuit 190, and the output end of the first comparison circuit 182 is connected to the control unit 160, and is used to output a first overcurrent protection signal when the differential amplified signal is greater than the reference voltage signal corresponding to the preset current threshold provided by the reference voltage circuit 190; the input end of the second comparison circuit 183 is respectively connected to the differential amplifier circuit 181 and the reference voltage circuit 190, and the output end of the second comparison circuit 183 is connected to the voltage conversion unit 120, and is used to output a second overcurrent protection signal when the differential amplified signal is greater than the reference voltage signal corresponding to the preset current threshold provided by the reference voltage circuit 190.

[0066] Specifically, refer to Figure 6As shown, due to the voltage-dividing function of the current-sense resistor RJ, the voltages at the first end and the second end of the current-sense resistor are inconsistent, and the greater the current of the load 200, the greater the voltage difference between the first end and the second end of the current-sense resistor, so the current-sense resistor RJ can convert the current signal of the load 200 into a voltage signal; then, the differential amplifier circuit 181 can differentially amplify the voltage difference of the voltage signal, and the voltage of the obtained differential amplified signal can represent the current of the load 200; then, the reference voltage circuit 190 can provide the first comparison circuit 182 and the second comparison circuit 183 with a reference voltage signal corresponding to the preset current threshold, and the first comparison circuit 182 and the second comparison circuit 183 can compare the differential amplified signal and the reference voltage signal. When the differential amplified signal is greater than the reference voltage signal, it means that the current of the load 200 is greater than the preset current threshold. At this time, the first comparison circuit 182 and the second comparison circuit 183 respectively output the first overcurrent protection signal and the second overcurrent protection signal, thereby realizing the protection function of the pulse generating circuit 100 and the load 200.

[0067] As a specific example, see Figure 7 As shown, the differential amplifier circuit 181 may include a first comparator BJ1, a third current limiting resistor RX3, a fourth current limiting resistor RX4 and a fifth current limiting resistor RX5, the negative input terminal of the first comparator BJ1 is connected to the first end of the current sensing resistor RJ through the third current limiting resistor RX3, the positive input terminal of the first comparator BJ1 is connected to the second end of the current sensing resistor RJ through the fourth current limiting resistor RX4, and the negative input terminal of the first comparator BJ1 is also connected to the output terminal of the first comparator BJ1 through the fifth current limiting resistor RX5; the first comparison circuit 182 may include a second comparator BJ2 and a sixth current limiting resistor RX6, the positive input terminal of the second comparator BJ2 is connected to the reference voltage circuit 190, and the second comparator BJ2 is connected to the reference voltage circuit 190. The negative input terminal of J2 is connected to the output terminal of the first comparator BJ1, the output terminal of the second comparator BJ2 is respectively connected to the control unit 160 and the first terminal of the sixth current limiting resistor RX6, and the second terminal of the sixth current limiting resistor RX6 is connected to the preset power supply VDD; the second comparison circuit 183 may include a third comparator BJ3 and a seventh current limiting resistor RX7, wherein the positive input terminal of the third comparator BJ3 is connected to the reference voltage circuit 190, the negative input terminal of the third comparator BJ3 is connected to the output terminal of the first comparator BJ1, the output terminal of the third comparator BJ3 is connected to the voltage conversion unit 120, and the output terminal of the third comparator BJ3 is also connected to the control unit 160 through the seventh current limiting resistor RX7.

[0068] Specifically, refer to Figure 7As shown, when the current of the load 200 increases, the voltage difference across the current sensing resistor RJ increases, thereby increasing the differential amplification signal output by the first comparator BJ1. When the differential amplification signal is greater than the reference voltage signal corresponding to the preset current threshold provided by the reference voltage circuit 190, it indicates that the current of the load 200 is too large. At this time, the negative input voltage of the second comparator BJ2 and the third comparator BJ3 is greater than the positive input voltage. The second comparator BJ2 outputs a low level as a first overcurrent protection signal to the control unit 160, and the third comparator BJ3 inputs a low level as a second overcurrent protection signal to the voltage conversion unit 120, so as to realize overcurrent protection for the pulse generating circuit 100. In the above process, the third to seventh current limiting resistors (RX3~RX7) all have the function of limiting current to reduce the power loss of the overcurrent protection unit. At the same time, the sixth current limiting resistor RX6 is also used to ensure that the second comparator BJ2 can output a stable low level, so that the control unit 160 can receive the first overcurrent protection signal, thereby improving the reliability of the overcurrent protection unit; in addition, since the output ends of the control unit 160 and the third comparator BJ3 are both connected to the voltage conversion unit 120, when the third comparator BJ3 outputs a low level, the high level of the control unit 160 will also be output to the third comparator BJ3, which will generate a large pulse current. Therefore, it is necessary to set the seventh current limiting resistor RX7 to limit the current to ensure the safety of the pulse generating circuit 100.

[0069] Optionally, the reference voltage circuit 190 may output a reference voltage signal via a voltage divider circuit, for example, Figure 7 As shown, the reference voltage circuit 190 may include a fifth voltage-dividing resistor RF5 and a sixth voltage-dividing resistor RF6, wherein one end of the fifth voltage-dividing resistor RF5 is connected to a preset power supply VDD, the other end of the fifth voltage-dividing resistor RF5 is respectively connected to the first comparison circuit 181, the second comparison circuit 182 and one end of the sixth voltage-dividing resistor RF6, and the other end of the sixth voltage-dividing resistor RF6 is connected to the first ground GND. According to the voltage-dividing principle, the reference voltage circuit 190 can output a reference voltage signal corresponding to a preset current threshold by adjusting the ratio of the preset power supply VDD voltage, the fifth voltage-dividing resistor RF5 and the sixth voltage-dividing resistor RF6.

[0070] In some embodiments, reference Figure 8As shown, the pulse generating unit 140 includes: a first diode D1, a first capacitor C1, a transformer TR, a second capacitor C2, a third switch tube Q3 and a second diode D2, wherein the anode of the first diode D1 is connected to the positive electrode of the energy storage unit 130 and the load 200 respectively; the first end of the first capacitor C1 is connected to the cathode of the first diode D1; one end of the primary winding of the transformer TR is connected to the second end of the first capacitor C1, one end of the secondary winding of the transformer TR is connected to the trigger end P_VDD of the load 200, and the other end of the primary winding of the transformer TR and the other end of the secondary winding of the transformer TR are connected to the second ground DC_N respectively; the first end of the second capacitor C2 is connected to the cathode of the first diode D1; the first end of the third switch tube Q3 is connected to the cathode of the first diode D1, the second end of the third switch tube Q3 is connected to the control unit 160, and the third end of the third switch tube Q3 is connected to the second ground DC_N; the anode of the second diode D2 is connected to the second end of the second capacitor C2 and the negative electrode of the load 200 respectively, and the cathode of the second diode D2 is connected to the second ground DC_N.

[0071] Specifically, refer to Figure 8As shown, the third switch tube Q3 can be a controllable thyristor, and the second end of the third switch tube Q3 is the control end. When the pulse generating unit 140 is required to generate a pulse voltage, the control unit 160 first controls the voltage conversion unit 120 to charge the energy storage unit 130, and the voltage across the energy storage unit 130 increases. In this process, the energy storage unit 130 also charges the first capacitor C1 and the second capacitor C2 through the first diode D1. When the voltage across the energy storage unit 130 rises to the target voltage, the control unit 160 outputs a high level to the second end of the third switch tube Q3 as a target pulse control signal, and the third switch tube Q3 is turned on. At this time, the first capacitor C1 discharges to the primary winding of the transformer TR through the third switch tube Q3, and the voltage across the first capacitor C1 is the primary winding voltage. At the same time, an induced voltage is generated on the secondary winding of the transformer TR, and the voltage is the voltage generated by the pulse generating unit 140. A pulse voltage is transmitted to the trigger terminal P_VDD of the load 200, triggering the load 200 to start, and the size of the pulse voltage can be adjusted based on the turns ratio of the primary winding and the secondary winding of the transformer TR, so that the trigger voltage requirements of different loads 200 can be met, making the pulse generating circuit 100 more applicable; at the same time, when the load 200 is started, part of the load 200 requires continuous power supply for a period of time. At this time, the energy storage unit 130 can be connected to the second ground DC_N through the positive and negative electrodes of the load 200 and the anode and cathode of the second diode D2, so that the energy storage unit 130 supplies power to the load 200 until the energy storage unit 130 is discharged; in addition, the second capacitor C2 is mainly used to transmit a stable voltage to the negative electrode of the load 200 when the pulse generating unit 140 generates a pulse voltage, so as to ensure that the generated pulse voltage has a sufficient voltage difference so that the load 200 starts stably.

[0072] It should be noted that the first ground GND in the embodiment of the present invention refers to a conventional ground, and the second ground DC_N refers to a common ground terminal of the pulse generating circuit 100. Fig. 9 As shown, since the negative output terminal of the rectifier unit 110 is connected to the second ground DC_N, the multiple electronic components in the pulse generating unit 140 also need to be connected to the second ground DC_N to be consistent with the potential of the negative output terminal of the rectifier unit 110, thereby ensuring that the high-voltage pulse of the pulse generating unit 140 can be generated stably. The specific principle will not be expanded here.

[0073] Thereby, the pulse generating unit realizes the function of generating a pulse voltage based on the voltage across the energy storage unit under the control of the control unit.

[0074] For further reference, Figure 8As shown, the pulse generating unit 140 further includes: a third diode D3 and a first resistor R1, wherein the cathode of the third diode D3 is connected to the second end of the third switch tube Q3, and the anode of the third diode Q3 is connected to the second ground DC_N; the first resistor R1 is connected in parallel with the third diode D3.

[0075] Specifically, the third diode D3 and the first resistor R1 are mainly used for voltage stabilization and current limiting. When the control unit 160 outputs the target pulse control signal to the pulse generating unit 140, the control unit 160 outputs a high level to the second end of the third switch tube Q3. The high level is clamped by the third diode D3 at the reverse breakdown voltage of the third diode D3 to provide a suitable control voltage for the third switch tube Q3. At the same time, the control unit 160 is connected to the second ground DC_N through the first resistor R1, so that the high level current is limited by the first resistor R1, thereby reducing the power loss of the pulse generating circuit and optimizing the pulse generating circuit.

[0076] In some embodiments, reference Fig. 9 As shown, the pulse generating unit 140 also includes: a photocoupler IC and a voltage divider circuit 141, wherein the first end of the photocoupler IC is connected to the control unit 160, the second end of the photocoupler IC is connected to the first ground GND, and the third end of the photocoupler IC is connected to the second end of the third switch tube Q3; the first end of the voltage divider circuit 140 is connected to the energy storage unit 130, the second end of the voltage divider circuit is connected to the second ground, and the third end of the voltage divider circuit is connected to the fourth end of the photocoupler.

[0077] Specifically, the photocoupler IC is mainly used to isolate the control unit 160 and the third switch tube Q3 to prevent the voltage of the third switch tube Q3 from affecting the control unit 160 and improve the reliability of the circuit. Figure 8 As shown, a light emitting diode is provided between the first and second ends of the photocoupler IC, and a phototransistor is provided between the third and fourth ends of the photocoupler IC. When the control unit 160 needs to turn on the third switch tube Q3, the control unit 160 outputs a high level to make the light emitting diode emit light, thereby turning on the phototransistor, and the third switch tube Q3 is turned on; the voltage divider circuit 141 is mainly used to provide a comparison voltage to the photocoupler IC, and can be composed of various forms of voltage divider circuits, for example, reference Fig. 9As shown, the voltage divider circuit 141 includes six voltage divider resistors RF3 to RF8, and the six voltage divider resistors RF3 to RF8 are connected in series in sequence, wherein the first end of the third voltage divider resistor RF3 is connected to the positive electrode H_VDD of the energy storage unit 130, the second end of the sixth voltage divider resistor is connected to the second ground DC_N, and the connection point of the fourth voltage divider resistor RF4 and the fifth voltage divider resistor RF5 is the third end of the voltage divider circuit 141. The voltage divider circuit 141 can output a reference voltage to the fourth end of the photocoupler IC according to the voltage division principle. Since the first end of the voltage divider circuit 141 is connected to the energy storage unit 1 30 is connected, and the second end is connected to the second ground DC_N. Therefore, the reference voltage provided by the voltage divider circuit 141 can be reduced as the voltage at both ends of the energy storage unit 130 gradually decreases. During the discharge process of the energy storage unit 130, the control unit 160 can continuously output a high level to keep the phototransistor turned on, and the voltage at both ends of the energy storage unit 130 gradually decreases, so that the voltage at the second end of the third switch tube Q3 is also reduced, until the voltage at the second end of the third switch tube Q3 is lower than the turn-on voltage, so that the third switch tube Q3 is turned off, so that the third switch tube Q3 realizes a self-shutdown function.

[0078] Optional, reference Fig. 9 As shown, the first end of the photocoupler IC is also connected to one end of the second resistor R2 and one end of the third resistor R3, the other end of the second resistor R2 is connected to the control unit 160, and the other end of the third resistor R3 is connected to the second end of the photocoupler IC and then to the first ground GND.

[0079] Specifically, when the control unit 160 outputs a high level, the second resistor R2 can effectively reduce the current in the circuit where the light-emitting diode in the photocoupler IC is located to prevent power loss of the pulse generating unit 140. At the same time, the second resistor R2 and the third resistor R3 form a voltage divider circuit, wherein the third resistor R3 is connected in parallel with the light-emitting diode. When the light-emitting diode is not emitting light, the third resistor R3 can ensure that the voltage across the two ends of the light-emitting diode is at least the voltage across the three resistors R3 to ensure that the light-emitting diode emits light stably. When the light-emitting diode emits light, the third resistor R3 is short-circuited to avoid additional loss in the third resistor R3, thereby optimizing the isolation function of the photocoupler.

[0080] In some embodiments, reference Fig. 9 As shown, the load 200 is a pulsed xenon lamp XQD.

[0081] Specifically, the pulse xenon lamp XQD has three ports, namely the positive pole, the negative pole and the trigger terminal P_VDD. In the triggering condition of the pulse xenon lamp XQD, in addition to obtaining a high-voltage pulse on the trigger terminal P_VDD, it is also necessary to obtain a stable DC voltage between the positive and negative poles. Therefore, refer to Fig. 9As shown, the positive electrode of the pulse xenon lamp XQD is connected to the energy storage unit 130, and the negative electrode of the pulse xenon lamp XQD is connected to the second ground DC_N through the second diode D2, wherein the trigger end P_VDD of the pulse xenon lamp XQD is connected to the pulse generating unit 140. In a single light-emitting cycle of the pulse xenon lamp XQD, when it is necessary to start the pulse xenon lamp XQD, the control unit 160 first controls the voltage conversion unit 120 to charge the energy storage unit 130 until the voltage across the energy storage unit 130 rises to the target voltage. At this time, the control unit 160 controls the pulse generating unit 140 to output a high-voltage pulse to the pulse xenon lamp XQD, so that the pulse xenon lamp XQD can be started stably; when the pulse xenon lamp XQD is started, the energy storage unit 130 can discharge the pulse xenon lamp XQD, so that the pulse xenon lamp XQD continues to emit light until the energy storage unit 130 is discharged and the pulse xenon lamp XQD is extinguished, and the single light-emitting cycle ends. Therefore, the pulse generating circuit 100 can meet the power supply requirement of the pulse xenon lamp XQD.

[0082] In summary, according to the pulse generating circuit of the embodiment of the present invention, a voltage conversion unit, an energy storage unit, a first voltage detection unit and a control unit are arranged after the rectifier unit, and the voltage at both ends of the energy storage unit is obtained through the control unit, and the voltage conversion unit is controlled by the control unit to charge the energy storage unit. When the voltage at both ends of the energy storage unit reaches the target voltage, a target pulse control signal is output, so that the pulse generating unit generates a pulse voltage and triggers the pulse to start, so that the circuit can supply power to the load without setting a switching power supply; at the same time, an overcurrent protection unit is arranged in the circuit, so that the load controls the voltage conversion unit to stop charging when overcurrent occurs, and at the same time, the continuous working time of the subsequent load is reduced, and the load current is reduced, thereby realizing overcurrent protection of the circuit and realizing a low-cost and high-reliability power supply function for the load.

[0083] Corresponding to the above embodiment, the embodiment of the present invention further provides a sterilization device, referring to Fig.10 As shown, the sterilization device 1000 includes: a pulse xenon lamp XQD; the aforementioned pulse generating circuit 100, the pulse generating circuit 100 is connected to the pulse xenon lamp XQD, and is used to trigger the pulse xenon lamp XQD to start.

[0084] According to the sterilization device of the embodiment of the present invention, the power supply cost of the pulse xenon lamp can be effectively reduced through the aforementioned pulse generating circuit, and at the same time, overcurrent protection of the pulse xenon lamp can be achieved, thereby reducing the cost of the sterilization device and improving the reliability of the sterilization device.

[0085] Corresponding to the above embodiment, the embodiment of the present invention further provides a household appliance, referring to Fig.11a As shown, the household appliance 10000 includes the aforementioned pulse generating circuit 100, or, referring to Fig.11bAs shown, the household appliance 10000 includes the aforementioned sterilization device 1000 .

[0086] According to the household appliance of the embodiment of the present invention, the power supply cost of the pulse xenon lamp can be effectively reduced through the aforementioned pulse generating circuit or the aforementioned sterilization device, while realizing overcurrent protection of the pulse xenon lamp, thereby reducing the cost of the household appliance and improving the reliability of the household appliance.

[0087] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0088] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0089] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" 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 invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0090] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0091] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0092] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A pulse generating circuit, characterized in that: include: A rectifier unit, the rectifier unit is connected to the AC power source and is used to convert the AC power into a first DC power; a voltage conversion unit and an energy storage unit, wherein the voltage conversion unit is connected to the rectification unit and the energy storage unit respectively, and is used to convert the first direct current into a second direct current to charge the energy storage unit; A pulse generating unit, the pulse generating unit is connected to the energy storage unit and the load respectively, and is used to generate a pulse voltage based on the voltage across the energy storage unit and provide it to the load; A first voltage detection unit, used to detect the voltage across the energy storage unit; A control unit, wherein the control unit is respectively connected to the voltage conversion unit, the pulse generating unit and the first voltage detection unit, and is used to control the voltage conversion unit to charge the energy storage unit, and when the voltage across the energy storage unit reaches a target voltage, output a target pulse control signal to control the pulse generating unit to generate the pulse voltage to trigger the load to start.

2. The pulse generating circuit according to claim 1, characterized in that: Also includes: A second voltage detection unit, used to detect the output voltage of the rectifier unit to obtain a bus voltage; The control unit is further used to determine a target duty cycle of the voltage conversion unit according to the target voltage and the bus voltage, and to control the voltage conversion unit according to the target duty cycle and the target switching frequency.

3. The pulse generating circuit according to claim 2, characterized in that: The control unit is further configured to gradually increase the target duty cycle before the voltage across the energy storage unit reaches the target voltage, until the voltage across the energy storage unit reaches the target voltage.

4. The pulse generating circuit according to claim 2, characterized in that: The control unit is further configured to increase the target switching frequency when the voltage across the energy storage unit does not reach the target voltage and the charging time of the energy storage unit reaches a preset time.

5. The pulse generating circuit according to any one of claims 1 to 4, characterized in that: Also includes: an overcurrent protection unit, configured to obtain a load current and output a first overcurrent protection signal when the load current reaches a preset current threshold, wherein the energy storage unit is also connected to the load to supply power to the load so that the load can work after the load is successfully started; The control unit is also used to reduce the duration of the target pulse control signal when the first overcurrent protection signal is received during the current operation of the load, and control the pulse generating unit to generate the pulse voltage based on the reduced target pulse control signal when the load is triggered to start next time.

6. The pulse generating circuit according to claim 5, characterized in that: The overcurrent protection unit is also connected to the voltage conversion unit, and the overcurrent protection unit is also used to output a second overcurrent protection signal when the load current reaches the preset current threshold to control the voltage conversion unit to stop working.

7. The pulse generating circuit according to claim 1, characterized in that: The voltage conversion unit comprises: A first switch tube, wherein a first end of the first switch tube is connected to the rectifying unit, and a second end of the first switch tube is connected to the control unit; A first inductor, wherein a first end of the first inductor is connected to the third end of the first switch tube, and a second end of the first inductor is connected to the energy storage unit.

8. The pulse generating circuit according to claim 7, characterized in that: The voltage conversion unit also includes: A second switch tube, wherein a first end of the second switch tube is connected to a second end of the first switch tube, a second end of the second switch tube is connected to the control unit, and a third end of the second switch tube is connected to a first ground.

9. The pulse generating circuit according to claim 6, characterized in that: The overcurrent protection unit comprises: A current-sensing resistor, which is connected in series between the energy storage unit and the load and is used to convert the load current into a voltage signal; A differential amplifier circuit, the input end of which is connected to the current-sense resistor, and is used to differentially amplify the voltage signal to obtain a differential amplified signal; a first comparison circuit, wherein an input end of the first comparison circuit is respectively connected to the differential amplifier circuit and the reference voltage circuit, and an output end of the first comparison circuit is connected to the control unit, and is used for outputting the first overcurrent protection signal when the differential amplification signal is greater than a reference voltage signal corresponding to the preset current threshold value provided by the reference voltage circuit; A second comparison circuit, wherein the input end of the second comparison circuit is respectively connected to the differential amplifier circuit and the reference voltage circuit, and the output end of the second comparison circuit is connected to the voltage conversion unit, and is used for outputting the second overcurrent protection signal when the differential amplifier signal is greater than the reference voltage signal corresponding to the preset current threshold provided by the reference voltage circuit.

10. The pulse generating circuit according to claim 5, characterized in that: The pulse generating unit comprises: a first diode, wherein an anode of the first diode is connected to a positive electrode of the energy storage unit and a positive electrode of the load respectively; a first capacitor, wherein a first end of the first capacitor is connected to a cathode of the first diode; A transformer, wherein one end of the primary winding of the transformer is connected to the second end of the first capacitor, one end of the secondary winding of the transformer is connected to the trigger end of the load, and the other end of the primary winding of the transformer and the other end of the secondary winding of the transformer are connected to a second ground respectively; a second capacitor, wherein a first end of the second capacitor is connected to a cathode of the first diode; a third switch tube, wherein a first end of the third switch tube is connected to the cathode of the first diode, a second end of the third switch tube is connected to the control unit, and a third end of the third switch tube is connected to a second ground; A second diode, wherein an anode of the second diode is connected to the second end of the second capacitor and the negative electrode of the load respectively, and a cathode of the second diode is connected to a second ground.

11. The pulse generating circuit according to claim 10, characterized in that: The pulse generating unit further comprises: a third diode, wherein a cathode of the third diode is connected to the second end of the third switch tube, and an anode of the third diode is connected to the second ground; A first resistor is connected in parallel with the third diode.

12. The pulse generating circuit according to claim 11, characterized in that: The pulse generating unit further comprises: A photoelectric coupler, wherein a first end of the photoelectric coupler is connected to the control unit, a second end of the photoelectric coupler is connected to a first ground, and a third end of the photoelectric coupler is connected to a second end of the third switch tube; A voltage divider circuit, wherein a first end of the voltage divider circuit is connected to the energy storage unit, a second end of the voltage divider circuit is connected to a second ground, and a third end of the voltage divider circuit is connected to a fourth end of the photoelectric coupler.

13. The pulse generating circuit according to claim 1, characterized in that: The load is a pulse xenon lamp.

14. A sterilization device, characterized in that: include: Pulsed xenon lamp; According to the pulse generating circuit according to any one of claims 1-13, the pulse generating circuit is connected to the pulse xenon lamp and is used to trigger the pulse xenon lamp to start.

15. A household appliance, characterized in that: It comprises a pulse generating circuit according to any one of claims 1 to 13, or a sterilization device according to claim 14.

Images