Relay module

Abstract

The utility model provides a relay module which comprises more than two relays and a switching circuit, and the more than two relays are divided into a first relay group and a second relay group. The switching circuit comprises a first power supply, a second power supply, a first MOS (Metal Oxide Semiconductor) tube, a second MOS tube, a third MOS tube, a fourth MOS tube, a fifth MOS tube, a sixth MOS tube, a seventh MOS tube, an eighth MOS tube, a first resistor, a second resistor, a third resistor and a fourth resistor, the first power supply and the second power supply respectively supply power to the two relay groups after being selected, and when both the first power supply and the second power supply are electrified, the first resistor, the second resistor, the third resistor and the fourth resistor are switched on; the two power supplies respectively supply power to the two relay sets, when one power supply is not powered, the other power supply simultaneously supplies power to the two relay sets, and after the power supplies are recovered, the mode that the two power supplies respectively supply power to the two relay sets is automatically switched. Effective power supply of the relay is ensured, and the burden of a single power supply is reduced.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, and in particular to a relay module. Background Technology

[0002] Existing relay modules typically consist of multiple relays, such as a 16-channel relay module composed of 16 relays. Figure 1 As shown, in the prior art, multiple relays (K1-Kn) are powered by the same power supply (Vout+, Vout-). If the power supply fails, all relays will fail to work properly. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a relay module with two power supplies and automatic switching of power supply modes.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A relay module includes two or more relays, which are divided into a first relay group and a second relay group. It also includes a switching circuit, which comprises a first power supply, a second power supply, a first MOSFET, a second MOSFET, a third MOSFET, a fourth MOSFET, a fifth MOSFET, a sixth MOSFET, a seventh MOSFET, an eighth MOSFET, a first resistor, a second resistor, a third resistor, and a fourth resistor. The gate of the first MOSFET, the gate of the second MOSFET, the drain of the third MOSFET, the gate of the fourth MOSFET, and the source of the fifth MOSFET are all connected to the positive terminal of the first power supply. The drain of the first MOSFET is connected to the drain of the second MOSFET, and the source of the second MOSFET is connected to the source of the third MOSFET. A first resistor is connected between the source of the third MOSFET and the drain of the fourth MOSFET. The gate of the third MOSFET is connected to the drain of the fourth MOSFET. The gate of the fourth MOSFET is grounded through the second resistor, and the source of the fourth MOSFET is connected to... The source of the first MOSFET, the gate of the fifth MOSFET, the gate of the sixth MOSFET, the drain of the seventh MOSFET, and the gate of the eighth MOSFET are all connected to the positive terminal of the second power supply. The drain of the fifth MOSFET is connected to the drain of the sixth MOSFET, and the source of the sixth MOSFET is connected to the source of the seventh MOSFET. A third resistor is connected between the source of the seventh MOSFET and the drain of the eighth MOSFET. The gate of the eighth MOSFET is grounded through a fourth resistor, and the source of the eighth MOSFET is grounded. The source of the third MOSFET is connected to the positive terminal of the power supply of the first relay group, and the source of the seventh MOSFET is connected to the positive terminal of the power supply of the second relay group. The negative terminals of the first power supply, the second power supply, the first relay group power supply, and the second relay group power supply are connected together. The first, second, third, fifth, sixth, and seventh MOSFETs are PMOS transistors, and the fourth and eighth MOSFETs are NMOS transistors.

[0006] Furthermore, it also includes a first reverse connection protection circuit and a second reverse connection protection circuit. The first reverse connection protection circuit includes a ninth MOSFET, a tenth MOSFET, an eleventh MOSFET, and a twelfth MOSFET. The second reverse connection protection circuit includes a thirteenth MOSFET, a fourteenth MOSFET, a fifteenth MOSFET, and a sixteenth MOSFET. The drain of the ninth MOSFET, the drain of the tenth MOSFET, the gate of the eleventh MOSFET, and the gate of the twelfth MOSFET are all connected to the positive terminal of the first power supply. The gate of the ninth MOSFET, the gate of the tenth MOSFET, the drain of the eleventh MOSFET, and the drain of the twelfth MOSFET are all connected to the negative terminal of the first power supply. The source of the ninth MOSFET and the source of the eleventh MOSFET are all connected to the gate of the first MOSFET, the gate of the second MOSFET, the drain of the third MOSFET, the gate of the fourth MOSFET, and the source of the fifth MOSFET. The drain of the thirteenth MOSFET, the drain of the fourteenth MOSFET, and the drain of the eleventh MOSFET are all connected to the gate of the first MOSFET, the gate of the second MOSFET, the drain of the third MOSFET, the gate of the fourth MOSFET, and the source of the fifth MOSFET. The gates of the fifteenth and sixteenth MOSFETs are both connected to the positive terminal of the second power supply. The gates of the thirteenth, fourteenth, fifteenth, and sixteenth MOSFETs are all connected to the negative terminal of the second power supply. The sources of the thirteenth and fifteenth MOSFETs are both connected to the source of the first MOSFET, the gate of the fifth MOSFET, the gate of the sixth MOSFET, the drain of the seventh MOSFET, and the gate of the eighth MOSFET. The sources of the tenth, twelfth, fourteenth, and sixteenth MOSFETs are connected to the negative terminal of the power supply of the first and second relay groups. The ninth, eleventh, thirteenth, and fifteenth MOSFETs are PMOS transistors, and the tenth, twelfth, fourteenth, and sixteenth MOSFETs are NMOS transistors.

[0007] The beneficial effects of this utility model are as follows:

[0008] Multiple relays are divided into two groups, using two power inputs. The two power inputs are selected and supply power to the two relay groups separately. When both the first and second power inputs are available, each power input supplies power to its respective relay group. When one power input fails, the other power input supplies power to both relay groups simultaneously. Once power is restored, the system automatically switches back to the mode where each power input supplies power to its respective relay group. This ensures effective power supply to the relays and reduces the load on a single power input. Attached Figure Description

[0009] Figure 1 The diagram shown is a structural schematic of a relay module in the prior art;

[0010] Figure 2 The diagram shown is a structural schematic of the relay module according to an embodiment of the present invention.

[0011] Figure 3 The diagram shown is a circuit diagram of the relay module according to an embodiment of the present invention.

[0012] Figure 4 The diagram shown is a circuit diagram of a relay module according to another embodiment of the present invention. Detailed Implementation

[0013] To better understand the technical content, objectives, and effects of this utility model, the following detailed description, in conjunction with specific embodiments and accompanying drawings, is provided. It should be noted that, unless otherwise specified, the embodiments and features of this utility model can be combined with each other. Many specific details are set forth in the following description to provide a thorough understanding of this utility model; the described embodiments are merely a part of, and not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0014] Please refer to Figures 2-4 As shown, the technical solution provided by this utility model is as follows:

[0015] A relay module includes two or more relays, which are divided into a first relay group and a second relay group. It also includes a switching circuit, which comprises a first power supply (Vin1+, Vin1-), a second power supply (Vin2+, Vin2-), a first MOSFET S1, a second MOSFET S2, a third MOSFET S3, a fourth MOSFET S4, a fifth MOSFET S5, a sixth MOSFET S6, a seventh MOSFET S7, an eighth MOSFET S8, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The gate of the first MOSFET S1... The gate of the first MOSFET S1, the drain of the second MOSFET S2, the gate of the third MOSFET S3, the gate of the fourth MOSFET S4, and the source of the fifth MOSFET S5 are all connected to the positive terminal Vin1+ of the first power supply. The drain of the first MOSFET S1 is connected to the drain of the second MOSFET S2, and the source of the second MOSFET S2 is connected to the source of the third MOSFET S3. A first resistor R1 is connected between the source of the third MOSFET S3 and the drain of the fourth MOSFET S4. The gate of the third MOSFET S3 is connected to the drain of the fourth MOSFET S4. The gate of the fourth MOSFET S4 is grounded through a second resistor R2, and the source of the fourth MOSFET S5... The first MOSFET S1's source, the fifth MOSFET S5's gate, the sixth MOSFET S6's gate, the seventh MOSFET S7's drain, and the eighth MOSFET S8's gate are all connected to the positive terminal Vin2+ of the second power supply. The drain of the fifth MOSFET S5 is connected to the drain of the sixth MOSFET S6, and the source of the sixth MOSFET S6 is connected to the source of the seventh MOSFET S7. A third resistor R3 is connected between the source of the seventh MOSFET S7 and the drain of the eighth MOSFET S8. The gate of the eighth MOSFET S8 is grounded through a fourth resistor R4, and the source of the eighth MOSFET S8 is grounded. The third MOSFET S3... The source of the seventh MOSFET S7 is connected to the positive terminal Vout1+ of the power supply of the first relay group, and the source of the seventh MOSFET S7 is connected to the positive terminal Vout2+ of the power supply of the second relay group. The negative terminals Vin1-, Vin2-, Vout-, and Vout- of the power supply of the first and second relay groups are connected. The first MOSFET S1, the second MOSFET S2, the third MOSFET S3, the fifth MOSFET S5, the sixth MOSFET S6, and the seventh MOSFET S7 are PMOS transistors, and the fourth MOSFET S4 and the eighth MOSFET S8 are NMOS transistors.

[0016] As can be seen from the above description, the beneficial effects of this utility model are as follows: multiple relays are divided into two groups, using two power inputs, and automatically switching between different power supply modes to power the relays. This ensures that the relays can receive effective power and reduces the burden on a single power supply.

[0017] Furthermore, it also includes a first reverse connection protection circuit and a second reverse connection protection circuit. The first reverse connection protection circuit includes a ninth MOSFET S9, a tenth MOSFET S10, an eleventh MOSFET S11, and a twelfth MOSFET S12. The second reverse connection protection circuit includes a thirteenth MOSFET S13, a fourteenth MOSFET S14, a fifteenth MOSFET S15, and a sixteenth MOSFET S16. The drain of the ninth MOSFET S9, the drain of the tenth MOSFET S10, the gate of the eleventh MOSFET S11, and the gate of the twelfth MOSFET S12 are all connected to the positive terminal V of the first power supply. In in1+, the gate of the ninth MOSFET S9, the gate of the tenth MOSFET S10, the drain of the eleventh MOSFET S11, and the drain of the twelfth MOSFET S12 are all connected to the negative terminal Vin1- of the first power supply. The source of the ninth MOSFET S9 and the source of the eleventh MOSFET S11 are all connected to the gate of the first MOSFET S1, the gate of the second MOSFET S2, the drain of the third MOSFET S3, the gate of the fourth MOSFET S4, and the source of the fifth MOSFET S5. The drain of the thirteenth MOSFET S13, the drain of the fourteenth MOSFET S14, and the drain of the fifteenth MOSFET S12 are all connected to the negative terminal Vin1- of the first power supply. The gates of S15 and the sixteenth MOSFET S16 are both connected to the positive terminal Vin2+ of the second power supply. The gates of the thirteenth MOSFET S13, the fourteenth MOSFET S14, the drains of the fifteenth MOSFET S15 and the sixteenth MOSFET S16 are all connected to the negative terminal Vin2- of the second power supply. The sources of the thirteenth MOSFET S13 and the fifteenth MOSFET S15 are both connected to the source of the first MOSFET S1, the gate of the fifth MOSFET S5, the gate of the sixth MOSFET S6, the drain of the seventh MOSFET S7, and the gate of the eighth MOSFET S8. The source of the tenth MOSFET S10, the source of the twelfth MOSFET S12, the source of the fourteenth MOSFET S14, the source of the sixteenth MOSFET S16, the negative terminal Vout- of the power supply terminal of the first relay group, and the negative terminal Vout- of the power supply terminal of the second relay group are connected. The ninth MOSFET S9, the eleventh MOSFET S11, the thirteenth MOSFET S13, and the fifteenth MOSFET S15 are PMOS transistors, and the tenth MOSFET S10, the twelfth MOSFET S12, the fourteenth MOSFET S14, and the sixteenth MOSFET S16 are NMOS transistors.

[0018] As described above, by setting up a first reverse connection protection circuit and a second reverse connection protection circuit, the switching circuit can still be powered normally even if the positive and negative terminals of the first and second power supplies are reversed. This effectively solves the problem of abnormal power supply caused by reverse connection in the prior art.

[0019] Please refer to Figures 2-4 Embodiment 1 of this utility model is as follows:

[0020] A relay module includes two or more relays, a switching circuit, a first reverse connection protection circuit, and a second reverse connection protection circuit. For example... Figure 2 As shown, two or more relays are divided into a first relay group (K11-K1n) and a second relay group (K21-K2n). The power supply terminals of the first relay group are (Vout1+, Vout-) and the power supply terminals of the second relay group are (Vout1+, Vout-). The two relay groups share the negative terminal Vout-.

[0021] The switching circuit includes a first power supply (Vin1+, Vin1-), a second power supply (Vin2+, Vin2-), a first MOSFET S1, a second MOSFET S2, a third MOSFET S3, a fourth MOSFET S4, a fifth MOSFET S5, a sixth MOSFET S6, a seventh MOSFET S7, an eighth MOSFET S8, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The first MOSFET S1, the second MOSFET S2, the third MOSFET S3, the fifth MOSFET S5, the sixth MOSFET S6, and the seventh MOSFET S7 are PMOS transistors, and the fourth MOSFET S4 and the eighth MOSFET S8 are NMOS transistors. The first reverse connection protection circuit includes a ninth MOSFET S9, a tenth MOSFET S10, an eleventh MOSFET S11, and a twelfth MOSFET S12. The second reverse connection protection circuit includes a thirteenth MOSFET S13, a fourteenth MOSFET S14, a fifteenth MOSFET S15, and a sixteenth MOSFET S16. The ninth MOSFET S9, the eleventh MOSFET S11, the thirteenth MOSFET S13, and the fifteenth MOSFET S15 are PMOS transistors, and the tenth MOSFET S10, the twelfth MOSFET S12, the fourteenth MOSFET S14, and the sixteenth MOSFET S16 are NMOS transistors.

[0022] The drain of the ninth MOSFET S9, the drain of the tenth MOSFET S10, the gate of the eleventh MOSFET S11, and the gate of the twelfth MOSFET S12 are all connected to the positive terminal Vin1+ of the first power supply. The gate of the ninth MOSFET S9, the gate of the tenth MOSFET S10, the drain of the eleventh MOSFET S11, and the drain of the twelfth MOSFET S12 are all connected to the negative terminal Vin1- of the first power supply. The source of the ninth MOSFET S9 and the source of the eleventh MOSFET S11 are all connected to the gate of the first MOSFET S1, the gate of the second MOSFET S2, the drain of the third MOSFET S3, the gate of the fourth MOSFET S4, and the source of the fifth MOSFET S5. The drain of the thirteenth MOSFET S13, the drain of the fourteenth MOSFET S14, the gate of the fifteenth MOSFET S15, and the gate of the sixteenth MOSFET S12 are all connected to the positive terminal Vin1+ of the first power supply. The gates of all 16 transistors are connected to the positive terminal Vin2+ of the second power supply. The gates of the thirteenth MOSFET S13, the fourteenth MOSFET S14, the drains of the fifteenth MOSFET S15, and the drains of the sixteenth MOSFET S16 are all connected to the negative terminal Vin2- of the second power supply. The sources of the thirteenth MOSFET S13 and the fifteenth MOSFET S15 are connected to the source of the first MOSFET S1, the gate of the fifth MOSFET S5, the gate of the sixth MOSFET S6, the drain of the seventh MOSFET S7, and the gate of the eighth MOSFET S8. The sources of the tenth MOSFET S10, the twelfth MOSFET S12, the fourteenth MOSFET S14, the sixteenth MOSFET S16, the negative terminal Vout- of the power supply of the first relay group, and the negative terminal Vout- of the power supply of the second relay group are connected.

[0023] The drain of the first MOSFET S1 is connected to the drain of the second MOSFET S2. The source of the second MOSFET S2 is connected to the source of the third MOSFET S3. A first resistor R1 is connected between the source of the third MOSFET S3 and the drain of the fourth MOSFET S4. The gate of the third MOSFET S3 is connected to the drain of the fourth MOSFET S4. The gate of the fourth MOSFET S4 is grounded through a second resistor R2. The source of the fourth MOSFET S4 is grounded. The drain of the fifth MOSFET S5 is connected to the drain of the sixth MOSFET S6. The source of the sixth MOSFET S6 is connected to the source of the seventh MOSFET S7. A third resistor R3 is connected between the source of the seventh MOSFET S7 and the drain of the eighth MOSFET S8. The gate of the eighth MOSFET S8 is grounded through a fourth resistor R4. The source of the eighth MOSFET S8 is grounded. The source of the third MOSFET S3 is connected to the positive terminal Vout1+ of the power supply of the first relay group. The source of the seventh MOSFET S7 is connected to the positive terminal Vout2+ of the power supply of the second relay group.

[0024] The working principle of the above relay module is as follows:

[0025] Reverse polarity protection circuit section:

[0026] When the first power supply (Vin1+, Vin1-) is properly wired, Vin1+ is connected to the positive input of the switching circuit via the ninth MOSFET S9, and Vin1- is connected to the negative input of the switching circuit via the twelfth MOSFET S12. When Vin1+ and Vin1- are reversed, Vin1+ is connected to the negative input of the switching circuit via the tenth MOSFET S10, and Vin1- is connected to the positive input of the switching circuit via the eleventh MOSFET S11. Therefore, the switching circuit can still be powered even with the first power supply (Vin1+, Vin1-) connected in reverse polarity.

[0027] When the second power supply (Vin2+, Vin2-) is properly wired, Vin2+ is connected to the positive input of the switching circuit via the thirteenth MOSFET S13, and Vin2- is connected to the negative input of the switching circuit via the sixteenth MOSFET S16. When the Vin2+ and Vin2- are reversed, Vin2+ is connected to the negative input of the switching circuit via the fourteenth MOSFET S14, and Vin2- is connected to the positive input of the switching circuit via the fifteenth MOSFET S15. Therefore, the switching circuit can still be powered even with the second power supply (Vin2+, Vin2-) connected in reverse polarity.

[0028] Switching circuit section:

[0029] (1) When both Vin1 and Vin2 are charged:

[0030] 1) The gate of the fourth MOSFET S4 is Vin1, so the fourth MOSFET S4 is turned on. The gate of the third MOSFET S3 is at a low level, so the third MOSFET S3 is turned on. Vin1 supplies power to the first relay group through the third MOSFET S3.

[0031] The gate of the first MOSFET S1 and the gate of the second MOSFET S2 are Vin1. Therefore, the first MOSFET S1 and the second MOSFET S2 are turned off. The parasitic diode of the first MOSFET is reverse-biased and cut off. Therefore, Vin2 cannot supply power to the first relay group. At this time, Vout1 is Vin1.

[0032] The parasitic diode of the second MOSFET S2 is reverse-biased and therefore Vout1 will not affect Vin2 (avoiding reverse power supply to it).

[0033] 2) The gate of the eighth MOSFET S8 is Vin2, so the eighth MOSFET S8 is turned on, the gate of the seventh MOSFET S7 is at a low level, the third MOSFET S3 is turned on, and Vin1 supplies power to the second relay group through the seventh MOSFET S7.

[0034] The gate of the fifth MOSFET S5 and the gate of the sixth MOSFET S6 are Vin2. Therefore, the fifth MOSFET S5 and the sixth MOSFET S6 are turned off. The parasitic diode of the fifth MOSFET S5 is reverse-biased and cut off. Therefore, Vin1 cannot supply power to the first relay group. At this time, Vout2 is Vin2.

[0035] The parasitic diode of the sixth MOSFET S6 is reverse-biased and therefore Vout2 will not affect Vin1 (avoiding reverse power supply to it).

[0036] (2) When Vin1 is de-energized and Vin2 is energized;

[0037] 1) When the gate of the first MOSFET S1 and the gate of the second MOSFET S2 are at low level, the first MOSFET S1 and the second MOSFET S2 are turned on. Vin2 supplies power to the first relay group through the first MOSFET S1 and the second MOSFET S2. At this time, Vout1 is Vin2.

[0038] The gate of the fourth MOSFET S4 is at a low level, so the fourth MOSFET S4 is turned off. The gate of the third MOSFET S3 is Vin2, so the third MOSFET S3 is turned off.

[0039] The parasitic diode of the third MOSFET S3 is reverse-biased and therefore Vout1 will not affect Vin1 (avoiding reverse power supply to it).

[0040] 2) The power supply for the second relay group is the same as in case (1), and will not be repeated here.

[0041] (3) When Vin1 is charged and Vin2 is not charged:

[0042] 1) The power supply for the first relay group is the same as in case (1), and will not be repeated here.

[0043] 2) The gates of the fifth MOSFET S5 and the sixth MOSFET S6 are at low level, so the fifth MOSFET S5 and the sixth MOSFET S6 are turned on. Vin1 supplies power to the second relay group through the fifth MOSFET S5 and the sixth MOSFET S6. At this time, Vout2 is Vin1.

[0044] The gate of the eighth MOSFET S8 is at a low level, so the eighth MOSFET S8 is turned off. The gate of the seventh MOSFET S7 is Vin1, so the seventh MOSFET S7 is turned off.

[0045] The parasitic diode of the sixth MOSFET S6 is reverse-biased and therefore Vout2 will not affect Vin2 (avoiding reverse power supply to it).

[0046] In summary, the relay module of this utility model comprises multiple relays divided into two groups, with two power inputs. Each power input has reverse connection protection, allowing normal operation even when the positive and negative terminals are reversed. The two power inputs are selected to supply power to the first and second relay groups respectively, automatically switching between different power supply modes to ensure that the relays receive effective power for normal operation and to reduce the burden on a single power supply.

[0047] The above description is merely an embodiment of the present utility model and does not limit the patent scope of the present utility model. Therefore, any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A relay module comprising two or more relays, characterized in that, The two or more relays are divided into a first relay group and a second relay group, and further include a switching circuit, the switching circuit including a first power supply, a second power supply, a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube, a fifth MOS tube, a sixth MOS tube, a seventh MOS tube, an eighth MOS tube, a first resistor, a second resistor, a third resistor and a fourth resistor, the gate of the first MOS tube, the gate of the second MOS tube, the drain of the third MOS tube, the gate of the fourth MOS tube and the source of the fifth MOS tube being connected to the positive pole of the first power supply, the drain of the first MOS tube being connected to the drain of the second MOS tube, the source of the second MOS tube being connected to the source of the third MOS tube, the first resistor being connected between the source of the third MOS tube and the drain of the fourth MOS tube, the gate of the third MOS tube being connected to the drain of the fourth MOS tube, the gate of the fourth MOS tube being connected to the ground through the second resistor, the source of the fourth MOS tube being connected to the ground, the source of the first MOS tube, the gate of the fifth MOS tube, the gate of the sixth MOS tube, the drain of the seventh MOS tube and the gate of the eighth MOS tube being connected to the positive pole of the second power supply, the drain of the fifth MOS tube being connected to the drain of the sixth MOS tube, the source of the sixth MOS tube being connected to the source of the seventh MOS tube, the third resistor being connected between the source of the seventh MOS tube and the drain of the eighth MOS tube, the gate of the eighth MOS tube being connected to the ground through the fourth resistor, the source of the eighth MOS tube being connected to the ground, the source of the third MOS tube being connected to the positive pole of a first relay group power supply terminal, the source of the seventh MOS tube being connected to the positive pole of a second relay group power supply terminal, the negative pole of the first power supply, the negative pole of the second power supply, the negative pole of the first relay group power supply terminal and the negative pole of the second relay group power supply terminal being connected, the first MOS tube, the second MOS tube, the third MOS tube, the fifth MOS tube, the sixth MOS tube and the seventh MOS tube being PMOS tubes, and the fourth MOS tube and the eighth MOS tube being NMOS tubes.

2. The relay module of claim 1, wherein, Also include the first anti-reverse connection circuit and the second anti-reverse connection circuit, the first anti-reverse connection circuit includes ninth MOS tube, tenth MOS tube, eleventh MOS tube and twelfth MOS tube, the second anti-reverse connection circuit includes thirteenth MOS tube, fourteenth MOS tube, fifteenth MOS tube and sixteenth MOS tube, the drain of ninth MOS tube, the drain of tenth MOS tube, the gate of eleventh MOS tube and the gate of twelfth MOS tube are all connected to the positive pole of first power supply, the gate of ninth MOS tube, the gate of tenth MOS tube, the drain of eleventh MOS tube and the drain of twelfth MOS tube are all connected to the negative pole of first power supply, the source of ninth MOS tube and the source of eleventh MOS tube are all connected to the gate of first MOS tube, the gate of second MOS tube, the drain of third MOS tube, the gate of fourth MOS tube and the source of fifth MOS tube, the drain of thirteenth MOS tube, the drain of fourteenth MOS tube, the gate of fifteenth MOS tube and the gate of sixteenth MOS tube are all connected to the positive pole of second power supply, the gate of thirteenth MOS tube, the gate of fourteenth MOS tube, the drain of fifteenth MOS tube and the drain of sixteenth MOS tube are all connected to the negative pole of second power supply, the source of thirteenth MOS tube and the source of fifteenth MOS tube are all connected to the source of first MOS tube, the gate of fifth MOS tube, the gate of sixth MOS tube, the drain of seventh MOS tube and the gate of eighth MOS tube, the source of tenth MOS tube, the source of twelfth MOS tube, the source of fourteenth MOS tube, the source of sixteenth MOS tube, the negative pole of first relay group power supply end and the negative pole of second relay group power supply end are connected, the ninth MOS tube, the eleventh MOS tube, the thirteenth MOS tube and the fifteenth MOS tube are PMOS tubes, and the tenth MOS tube, the twelfth MOS tube, the fourteenth MOS tube and the sixteenth MOS tube are NMOS tubes.

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