Intelligent control circuit of household appliance circuit board

Abstract

The utility model discloses an intelligent control circuit of a household electrical appliance circuit board, which relates to the technical field of household electrical appliance circuit boards and comprises a power supply module used for electric energy conversion processing and power supply; the human body induction module is used for performing human body pyroelectric induction and controlling the power supply control module to perform electric energy transmission work when inducting a human body; the trigger control module is used for controlling the delay control module to carry out delay work when the duration of sensing the human body exceeds the timing time; the delay control module is used for setting delay time and performing delay control on power supply work of the power supply control module; and the power supply control module is used for controlling electric energy transmission and supplying power to the household appliance circuit board connected with the household appliance circuit board module. The intelligent control circuit of the household electrical appliance circuit board can improve the self-starting intelligence of the household electrical appliance circuit board and reduce the energy loss of the household electrical appliance circuit board.

Description

TECHNICAL FIELD

[0001] The utility model relates to domestic appliance circuit board technical field, concretely is a kind of intelligent control circuit of domestic appliance circuit board. BACKGROUND

[0002] With the development of science and technology, the concept of smart home has been deeply rooted in people's hearts, and domestic appliance circuit board is an indispensable part of domestic appliance in smart home, mainly used to realize the electrical connection and signal transmission between various electronic components, to improve the intelligence of domestic appliance circuit board, the domestic appliance circuit board in the prior art generally adopts the mode of infrared induction, when sensing the user, automatically start, and after starting, delay power-off control, cannot automatically adjust the starting duration according to the time of infrared induction, resulting in the increase of the power consumption of domestic appliance circuit board, so it needs to be improved. UTILITY MODEL CONTENT

[0003] The utility model embodiment provides a kind of intelligent control circuit of domestic appliance circuit board to solve the problems raised in the above background technique.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] A kind of intelligent control circuit of domestic appliance circuit board, comprising: power module, human body sensing module, trigger control module, delay control module, power control module and domestic appliance circuit board module;

[0006] Power module is used to connect mains and carry out voltage reduction and rectifier filter processing and output first electric energy, carries out voltage stabilizing filter processing to first electric energy and outputs second electric energy;

[0007] Human body sensing module is connected with the power module, for receiving first electric energy and carrying out human body pyroelectric induction, after sensing human body pyroelectric signal, output first sensing signal and carry out amplification filter processing to first sensing signal, output first control signal;

[0008] Trigger control module is connected with the human body sensing module and power module, for receiving second electric energy and outputting second control signal when receiving first control signal, output third control signal when the duration of received second control signal exceeds the set timing time;

[0009] Delay control module is connected with the trigger control module and power module, for setting delay time and receiving second electric energy and outputting fourth control signal when receiving third control signal, output fourth control signal in delay time when stopping receiving third control signal;

[0010] The power supply control module is connected with the power supply module, the human body induction module, the delay control module and the household appliance circuit board module, and is used for transmitting the first electric energy to the household appliance circuit board module when the first control signal or the fourth control signal is received.

[0011] The household appliance circuit board module is used for transmitting the received first electric energy to the connected household appliance circuit board.

[0012] As a further scheme of the utility model: the power supply module includes a power supply interface, a first transformer, a first rectifier, a first capacitor, a first voltage stabilizer and a second capacitor;

[0013] Preferably, the first end and the second end of the power supply interface are connected with the first end and the second end of the primary side of the first transformer respectively, the first end and the second end of the secondary side of the first transformer are connected with the first end and the second end of the first rectifier respectively, the third end of the first rectifier is connected with the first end of the first voltage stabilizer and the fourth end of the first rectifier, the second end of the first voltage stabilizer, one end of the second capacitor and the ground end through the first capacitor, and the other end of the second capacitor is connected with the third end of the first voltage stabilizer, the human body induction module, the trigger control module and the delay control module.

[0014] As a further scheme of the utility model: the power supply control module includes a first power tube, a third resistor and a second switch tube; the household appliance circuit board module includes a household appliance circuit board interface;

[0015] Preferably, the source of the first power tube is connected with the first end of the first voltage stabilizer and the gate of the first power tube and the collector of the second switch tube through the third resistor, the drain of the first power tube is connected with the first end of the household appliance circuit board interface, the emitter of the second switch tube is connected with the fourth end of the first rectifier and the second end of the household appliance circuit board interface, and the base of the second switch tube is connected with the human body induction module and the delay control module.

[0016] As a further scheme of the utility model: the human body induction module includes a first sensor, a fifth capacitor, a sixth capacitor, a ninth resistor, a seventh switch tube, a tenth resistor, a seventh capacitor, a twelfth resistor, an eleventh resistor, an eighth capacitor, a first operational amplifier, a first resistor, a first switch tube, a second resistor and a first diode;

[0017] Preferably, the D end of the first sensor is connected with the third end of the first stabilizer and the collector of the first switch tube, and is connected with one end of the ninth resistor and the collector of the seventh switch tube through the tenth resistor, the other end of the ninth resistor is connected with the base of the seventh switch tube and one end of the sixth capacitor and is connected with the S end of the first sensor through the fifth capacitor, the other end of the sixth capacitor is connected with the inverting end of the first operational amplifier, the noninverting end of the first operational amplifier is connected with one end of the eleventh resistor and one end of the eighth capacitor and is connected with the emitter of the seventh switch tube, the E end of the first sensor, the second end of the first stabilizer, one end of the second capacitor and the ground end in turn through the twelfth resistor and the seventh capacitor, the output end of the first operational amplifier is connected with the other end of the eleventh resistor, the other end of the eighth capacitor and the first end of the first resistor, the second end of the first resistor is connected with the base of the first switch tube, the emitter of the first switch tube is connected with the anode of the first diode and the other end of the second resistor, the cathode of the first diode is connected with the base of the second switch tube.

[0018] As a further scheme of the utility model: the trigger control module includes third switch tube, fourth resistor, fifth resistor, third capacitor, fourth switch tube and sixth resistor;

[0019] Preferably, the collector of the third switch tube is connected with the collector of the fourth switch tube and the third end of the first stabilizer, the emitter of the third switch tube is connected with one end of the third capacitor and one end of the fourth resistor and is connected with the base of the fourth switch tube through the fifth resistor, the emitter of the fourth switch tube is connected with the delay control module and is connected with the other end of the third capacitor, the other end of the fourth resistor and the ground end through the sixth resistor.

[0020] As a further scheme of the utility model: the delay control module includes fifth switch tube, seventh resistor, fourth capacitor, eighth resistor, sixth switch tube and second diode;

[0021] Preferably, the base of the fifth switch tube is connected with the emitter of the fourth switch tube, the collector of the fifth switch tube is connected with the collector of the sixth switch tube and the third end of the first stabilizer, the emitter of the fifth switch tube is connected with the base of the sixth switch tube and one end of the fourth capacitor and is connected with the other end of the fourth capacitor, one end of the eighth resistor and the fourth end of the first rectifier through the seventh resistor, the other end of the eighth resistor is connected with the anode of the second diode and the emitter of the sixth switch tube, the cathode of the second diode is connected with the base of the second switch tube.

[0022] Compared with the prior art, the household appliance circuit board intelligent control circuit can be in human body induction by the human body induction module, and when the time of induction of the human body does not exceed the timing time set by the trigger control module, the power supply control module will supply power to the household appliance circuit board module when the human body is inducted, and if the time of induction of the human body exceeds the first timing signal, the power supply control module will supply power to the household appliance circuit board module when the human body induction module does not induct the human body, the self-starting intelligence of the household appliance circuit board is improved, and the energy consumption of the household appliance circuit board is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 A principle block diagram of the intelligent control circuit of the household appliance circuit board is provided for the embodiments of the present application.

[0025] Figure 2 A circuit diagram of the intelligent control circuit of the household appliance circuit board is provided for the embodiments of the present application.

[0026] Figure 3 A connection circuit diagram of the human body induction module is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0027] The technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0028] In one embodiment, please refer to Figure 1 An intelligent control circuit of a household appliance circuit board, comprising: a power module 1, a human body induction module 2, a trigger control module 3, a delay control module 4, a power supply control module 5 and a household appliance circuit board module 6.

[0029] Specifically, the power module 1 is used for connecting to the commercial power, performing step-down and rectification filtering processing on the commercial power and outputting first electric energy, performing voltage stabilization filtering processing on the first electric energy and outputting second electric energy.

[0030] The human body induction module 2 is connected with the power module 1, and is used for receiving the first electric energy and conducting human body pyroelectric induction. After the human body pyroelectric signal is induced, the first induction signal is outputted and the first induction signal is amplified and filtered, and the first control signal is outputted;

[0031] The trigger control module 3 is connected with the human body induction module 2 and the power module 1, and is used for receiving the second electric energy and outputting the second control signal when the first control signal is received. When the duration of the received second control signal exceeds the set timing time, the third control signal is outputted.

[0032] The delay control module 4 is connected with the trigger control module 3 and the power module 1, and is used for setting the delay time and receiving the second electric energy. When the third control signal is received, the fourth control signal is outputted. When the third control signal is stopped, the fourth control signal is outputted in the delay time.

[0033] The power control module 5 is connected with the power module 1, the human body induction module 2, the delay control module 4 and the household appliance circuit board module 6, and is used for transmitting the first electric energy to the household appliance circuit board module 6 when the first control signal or the fourth control signal is received.

[0034] The household appliance circuit board module 6 is used for transmitting the received first electric energy to the connected household appliance circuit board.

[0035] In the specific embodiment, the power module 1 can adopt a power circuit composed of a power interface, a transformer, a rectifier, a voltage stabilizer, etc. The power circuit can be connected with the commercial power and conduct voltage reduction, rectification filtering and voltage stabilization filtering on the commercial power. The human body induction module 2 can adopt a human body induction circuit composed of a human body pyroelectric sensor, an operational amplifier, a capacitor, etc. The human body induction circuit can conduct human body pyroelectric induction and amplify and filter the induced signal. The trigger control module 3 can adopt a trigger control circuit composed of a triode, a capacitor and a resistor. The trigger control circuit can set the timing time, detect whether the duration of the first control signal outputted by the human body induction module 2 exceeds the timing time, and control the delay control module 4 to work when the duration exceeds the timing time. The delay control module 4 can adopt a delay control circuit composed of a capacitor, a resistor and a triode. The delay control circuit can set the delay time and output the signal in the high level state in the delay time when the trigger control module 3 stops outputting the signal. The power control module 5 can adopt a power control circuit composed of a field effect transistor, a resistor and a triode. The power control circuit can control the transmission of the electric energy. The household appliance circuit board module 6 can adopt a household appliance circuit board circuit composed of a household appliance circuit board interface. The household appliance circuit board circuit is connected with the power end of the household appliance circuit board.

[0036] In another embodiment, please refer to Figure 1 , Figure 2 and Figure 3The power module 1 comprises a power interface, a first transformer B1, a first rectifier T1, a first capacitor C1, a first voltage stabilizer IC1 and a second capacitor C2.

[0037] Specifically, the first end and the second end of the power interface are connected to the first end and the second end of the primary side of the first transformer B1 respectively, the first end and the second end of the secondary side of the first transformer B1 are connected to the first end and the second end of the first rectifier T1 respectively, the third end of the first rectifier T1 is connected to the first end of the first voltage stabilizer IC1, the fourth end of the first rectifier T1, the second end of the first voltage stabilizer IC1, one end of the second capacitor C2 and the ground end are connected through the first capacitor C1, the other end of the second capacitor C2 is connected to the third end of the first voltage stabilizer IC1, the human body induction module 2, the trigger control module 3 and the delay control module 4.

[0038] In a specific embodiment, the first voltage stabilizer IC1 can be a 7809 voltage stabilizer.

[0039] Further, the power control module 5 comprises a first power tube Q1, a third resistor R3 and a second switch tube V2; the household appliance circuit board module 6 comprises a household appliance circuit board interface.

[0040] Specifically, the source of the first power tube Q1 is connected to the first end of the first voltage stabilizer IC1 and the gate of the first power tube Q1 and the collector of the second switch tube V2 are connected through the third resistor R3, the drain of the first power tube Q1 is connected to the first end of the household appliance circuit board interface, the emitter of the second switch tube V2 is connected to the fourth end of the first rectifier T1 and the second end of the household appliance circuit board interface, the base of the second switch tube V2 is connected to the human body induction module 2 and the delay control module 4.

[0041] In a specific embodiment, the first power tube Q1 can be a P-channel field effect tube; the second switch tube V2 can be an NPN type triode.

[0042] Further, the human body induction module 2 comprises a first sensor IC2, a fifth capacitor C5, a sixth capacitor C6, a ninth resistor R9, a seventh switch tube V7, a tenth resistor R10, a seventh capacitor C7, a twelfth resistor R12, an eleventh resistor R11, an eighth capacitor C8, a first operational amplifier OP1, a first resistor R1, a first switch tube V1, a second resistor R2 and a first diode D1.

[0043] Specifically, the D terminal of the first sensor IC2 is connected to the third terminal of the first voltage stabilizer IC1 and the collector of the first switch tube V1, and is connected to one end of the ninth resistor R9 and the collector of the seventh switch tube V7 through the tenth resistor R10, the other end of the ninth resistor R9 is connected to the base of the seventh switch tube V7 and one end of the sixth capacitor C6 and is connected to the S terminal of the first sensor IC2 through the fifth capacitor C5, the other end of the sixth capacitor C6 is connected to the inverting terminal of the first operational amplifier OP1, the non-inverting terminal of the first operational amplifier OP1 is connected to one end of the eleventh resistor R11 and one end of the eighth capacitor C8 and is connected to the emitter of the seventh switch tube V7, the E terminal of the first sensor IC2, the second terminal of the first voltage stabilizer IC1, one end of the second capacitor C2 and the ground terminal in turn through the twelfth resistor R12 and the seventh capacitor C7, the output terminal of the first operational amplifier OP1 is connected to the other end of the eleventh resistor R11, the other end of the eighth capacitor C8 and the first terminal of the first resistor R1, the second terminal of the first resistor R1 is connected to the base of the first switch tube V1, the emitter of the first switch tube V1 is connected to the anode of the first diode D1 and the other end of the second resistor R2, and the cathode of the first diode D1 is connected to the base of the second switch tube V2.

[0044] In specific embodiments, the above-mentioned first sensor IC2 can be selected as an HC-SR501 sensor, the above-mentioned seventh switch tube V7 can be selected as an NPN triode, and the fifth capacitor C5, the sixth capacitor C6, the ninth resistor R9 and the tenth resistor R10 are used for first-stage amplification and filtering processing, the above-mentioned first operational amplifier OP1 can be selected as an OP07 operational amplifier, and the eighth capacitor C8, the eleventh resistor R11, the twelfth resistor R12 and the seventh capacitor C7 are used for second-stage amplification and filtering processing, and the above-mentioned first switch tube V1 can be selected as an NPN triode, and the first resistor R1 and the second resistor R2 are used to provide a high-level signal, i.e., a first control signal.

[0045] Further, the trigger control module 3 comprises a third switch tube V3, a fourth resistor R4, a fifth resistor R5, a third capacitor C3, a fourth switch tube V4 and a sixth resistor R6.

[0046] Specifically, the collector of the third switch tube V3 is connected to the collector of the fourth switch tube V4 and the third terminal of the first voltage stabilizer IC1, the emitter of the third switch tube V3 is connected to one end of the third capacitor C3 and one end of the fourth resistor R4 and is connected to the base of the fourth switch tube V4 through the fifth resistor R5, the emitter of the fourth switch tube V4 is connected to the delay control module 4 and is connected to the other end of the third capacitor C3, the other end of the fourth resistor R4 and the ground terminal through the sixth resistor R6.

[0047] In specific embodiments, the third switch V3 and the fourth switch V4 can be NPN type triodes; the third capacitor C3, the fourth resistor R4 and the fifth resistor R5 set a timing time, which is the time when the third capacitor C3 starts to store energy and the fourth switch V4 turns on.

[0048] Further, the delay control module 4 includes a fifth switch V5, a seventh resistor R7, a fourth capacitor C4, an eighth resistor R8, a sixth switch V6 and a second diode D2.

[0049] Specifically, the base of the fifth switch V5 is connected to the emitter of the fourth switch V4, the collector of the fifth switch V5 is connected to the collector of the sixth switch V6 and the third terminal of the first voltage stabilizer IC1, the emitter of the fifth switch V5 is connected to the base of the sixth switch V6 and one end of the fourth capacitor C4 and the other end of the fourth capacitor C4, one end of the eighth resistor R8 and the fourth terminal of the first rectifier T1 through the seventh resistor R7, the other end of the eighth resistor R8 is connected to the anode of the second diode D2 and the emitter of the sixth switch V6, and the cathode of the second diode D2 is connected to the base of the second switch V2.

[0050] In specific embodiments, the fifth switch V5 and the sixth switch V6 can be NPN type triodes; the seventh resistor R7 and the fourth capacitor C4 set a delay time, which is stored by the fourth capacitor C4 to control the delay discharge.

[0051] The first sensor IC2 carries out pyroelectric induction of human body, the signal sensed is amplified and filtered by the fifth capacitor C5, the sixth capacitor C6, the ninth resistor R9, the tenth resistor R10, the seventh switch tube V7, the seventh capacitor C7, the twelfth resistor R12, the eleventh resistor R11, the first operational amplifier OP1 and the eighth capacitor C8, and outputs a first control signal, triggering the first switch tube V1 to conduct, the second switch tube V2 to conduct through the first diode D1, the first power tube Q1 to conduct, the first electric energy being transmitted to the power supply end of the household appliance circuit board connected to the household appliance circuit board interface, and the third switch tube V3 to conduct, the third capacitor C3 starting to store energy, when the fourth switch tube V4 does not conduct, that is, the time length of the sensed human body does not exceed the timing time set by the fourth resistor R4, the third capacitor C3 and the fifth resistor R5, the switching state of the first power tube Q1 is determined according to the state of the sensed human body by the first sensor IC2, when the time of the sensed human body exceeds the timing time, the fourth switch tube V4 will conduct, triggering the fifth switch tube V5 to conduct, triggering the sixth switch tube V6 to conduct, the fourth capacitor C4 storing energy, triggering the second switch tube V2 to conduct, after the first sensor IC2 stops sensing the human body, the fourth capacitor C4 will discharge, the sixth switch tube V6 is controlled to conduct in delay, and then the first power tube Q1 is controlled to conduct in delay, and the delay is to supply power to the power supply end of the household appliance circuit board.

[0052] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Accordingly, the embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the present application being indicated by the appended claims rather than by the foregoing description, and it is intended that all changes and modifications which come within the meaning and range of equivalency of the claims are reserving to the present application. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0053] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. An intelligent control circuit for a household appliance circuit board, characterized in that, the intelligent control circuit for the household appliance circuit board comprises a power module, a human body sensing module, a trigger control module, a delay control module, a power control module and a household appliance circuit board module; the power module is configured to access mains power, perform step-down and rectification filtering on the mains power and output first electric energy, and perform voltage stabilization filtering on the first electric energy and output second electric energy; the human body sensing module is connected to the power module and configured to receive the first electric energy and perform human body pyroelectric sensing, output a first sensing signal after sensing a human body pyroelectric signal, amplify and filter the first sensing signal, and output a first control signal; the trigger control module is connected to the human body sensing module and the power module and configured to receive the second electric energy, output a second control signal when the first control signal is received, and output a third control signal when the duration of the received second control signal exceeds a set timing time; the delay control module is connected to the trigger control module and the power module and configured to set a delay time, receive the second electric energy, output a fourth control signal when the third control signal is received, and output the fourth control signal with a delay within the delay time when the third control signal is stopped; the power control module is connected to the power module, the human body sensing module, the delay control module and the household appliance circuit board module, and configured to transmit the first electric energy to the household appliance circuit board module when the first control signal or the fourth control signal is received; the household appliance circuit board module is configured to transmit the received first electric energy to the connected household appliance circuit board.

2. The intelligent control circuit of a circuit board of a household appliance according to claim 1, characterized in that, the power module comprises a power interface, a first transformer, a first rectifier, a first capacitor, a first voltage stabilizer and a second capacitor; the first end and the second end of the power interface are connected to the first end and the second end of the primary side of the first transformer, the first end and the second end of the secondary side of the first transformer are connected to the first end and the second end of the first rectifier, the third end of the first rectifier is connected to the first end of the first voltage stabilizer and the fourth end of the first rectifier, the second end of the first voltage stabilizer, one end of the second capacitor and the ground end through the first capacitor, and the other end of the second capacitor is connected to the third end of the first voltage stabilizer, the human body sensing module, the trigger control module and the delay control module.

3. The intelligent control circuit of a circuit board of a household appliance according to claim 2, characterized in that, the power control module comprises a first power tube, a third resistor and a second switch tube; the household appliance circuit board module comprises a household appliance circuit board interface; the source of the first power tube is connected to the first end of the first voltage stabilizer and the gate of the first power tube and the collector of the second switch tube through the third resistor, the drain of the first power tube is connected to the first end of the household appliance circuit board interface, the emitter of the second switch tube is connected to the fourth end of the first rectifier and the second end of the household appliance circuit board interface, and the base of the second switch tube is connected to the human body sensing module and the delay control module.

4. The intelligent control circuit of a circuit board of a household appliance according to claim 3, characterized in that, The human body induction module comprises a first sensor, a fifth capacitor, a sixth capacitor, a ninth resistor, a seventh switch tube, a tenth resistor, a seventh capacitor, a twelfth resistor, an eleventh resistor, an eighth capacitor, a first operational amplifier, a first resistor, a first switch tube, a second resistor and a first diode; The D end of the first sensor is connected with the third end of a first stabilizer and the collector of the first switch tube, and is connected with one end of the ninth resistor and the collector of the seventh switch tube through the tenth resistor; the other end of the ninth resistor is connected with the base of the seventh switch tube and one end of the sixth capacitor, and is connected with the S end of the first sensor through the fifth capacitor; the other end of the sixth capacitor is connected with the inverting end of the first operational amplifier; the non-inverting end of the first operational amplifier is connected with one end of the eleventh resistor and one end of the eighth capacitor, and is connected with the emitter of the seventh switch tube, the E end of the first sensor, the second end of the first stabilizer, one end of the second capacitor and the ground end in sequence through the twelfth resistor and the seventh capacitor; the output end of the first operational amplifier is connected with the other end of the eleventh resistor, the other end of the eighth capacitor and the first end of the first resistor; the second end of the first resistor is connected with the base of the first switch tube; the emitter of the first switch tube is connected with the anode of the first diode and the other end of the second resistor; the cathode of the first diode is connected with the base of the second switch tube.

5. The intelligent control circuit of a circuit board of a household appliance according to claim 4, characterized in that, The trigger control module comprises a third switch tube, a fourth resistor, a fifth resistor, a third capacitor, a fourth switch tube and a sixth resistor; The collector of the third switch tube is connected with the collector of the fourth switch tube and the third end of the first stabilizer; the emitter of the third switch tube is connected with one end of the third capacitor and one end of the fourth resistor, and is connected with the base of the fourth switch tube through the fifth resistor; the emitter of the fourth switch tube is connected with the delay control module, and is connected with the other end of the third capacitor, the other end of the fourth resistor and the ground end through the sixth resistor.

6. The intelligent control circuit of a circuit board of a household appliance according to claim 5, characterized in that, The delay control module comprises a fifth switch tube, a seventh resistor, a fourth capacitor, an eighth resistor, a sixth switch tube and a second diode; The base of the fifth switch tube is connected with the emitter of the fourth switch tube; the collector of the fifth switch tube is connected with the collector of the sixth switch tube and the third end of the first stabilizer; the emitter of the fifth switch tube is connected with the base of the sixth switch tube and one end of the fourth capacitor, and is connected with the other end of the fourth capacitor, one end of the eighth resistor and the fourth end of the first rectifier through the seventh resistor; the other end of the eighth resistor is connected with the anode of the second diode and the emitter of the sixth switch tube; the cathode of the second diode is connected with the base of the second switch tube.

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