CN211977317U - Refrigeration and preheat drive control circuits and electrical equipment - Google Patents

Abstract

The utility model relates to a refrigeration and preheating drive control circuit and electrical equipment. The first input end of the circuit; the same-direction output end of the second switch circuit is connected to the first input end of the second gate circuit, and the reverse output end of the second switch circuit is connected to the first input end of the fourth gate circuit; the first gate The ground reference terminal of the control module is connected to the potential pulling circuit, and the power terminal of the first gate control module is used to connect the DC high voltage source; the second gate of the first gate circuit, the second gate circuit, the third gate circuit and the fourth gate circuit The input terminals are respectively used to connect to external level signal sources; the output terminals of the first gate circuit, the second gate circuit, the third gate circuit and the fourth gate circuit are used to connect to the TEC refrigeration and preheating control module. The utility model can realize rapid heating and cooling, and is suitable for most electrical equipment, especially high-power electrical equipment.

Description

Refrigeration and preheat drive control circuits and electrical equipment

technical field

The utility model relates to the technical field of electronic circuits, in particular to a refrigeration and preheating drive control circuit and electrical equipment.

Background technique

At present, more and more equipment needs to be warmed up and started and cooled to ensure normal operation. However, part of the drive control circuit for cooling and heating in the conventional technology has less drive capability. With the improvement of power requirements of electrical equipment, although there are some refrigeration and heating devices with high output load power, the circuit structure is relatively complex, not perfect, and inconvenient for driving control, and if the voltage drop of the load is low, the long-term Overcurrent of time will cause adverse effects such as damage to the circuit. Therefore, the cooling and heating device loaded in the conventional technology has less limitations.

Utility model content

In view of the above problems, the purpose of the present invention is to provide a cooling and preheating drive control circuit and electrical equipment.

In one embodiment, the present invention provides a refrigeration and preheating drive control circuit, including: a first switch circuit, a second switch circuit, a first door control module, a second door control module, and a potential pull-up circuit ;

The input ends of the first switch circuit and the second switch circuit are used to access external level signals opposite to each other; the first gate control module includes a first gate circuit and a second gate circuit; the second gate control module includes a third gate circuit and the fourth gate circuit;

The non-directional output end of the first switch circuit is connected to the first input end of the first gate circuit, and the reverse output end of the first switch circuit is connected to the first input end of the third gate circuit;

The non-directional output end of the second switch circuit is connected to the first input end of the second gate circuit, and the reverse output end of the second switch circuit is connected to the first input end of the fourth gate circuit;

The ground reference terminal of the first door control module is connected to the potential pulling circuit, and the power terminal of the first door control module is used to connect to the DC high voltage source;

The respective second input terminals of the first gate circuit, the second gate circuit, the third gate circuit and the fourth gate circuit are respectively used to connect an external level signal source; the first gate circuit, the second gate circuit, the third gate circuit and The output end of the fourth gate circuit is used to connect to the TEC cooling and preheating control module.

In one of the embodiments, the first switch circuit includes a first switch device, a first transistor, a first pull-down resistor, and a first pull-up resistor;

The second switch circuit includes a second switch device, a second transistor, a second pull-down resistor, and a second pull-up resistor;

The output end of the first switching device is respectively connected to one end of the first pull-down resistor and the base of the first triode; the collector of the first triode is connected to the first pull-up resistor; the emitter of the first triode and the The other end of the first pull-down resistor is grounded; the input end of the first switch device is used as the input end of the first switch circuit, and the output end of the first switch device is used as the reverse output end of the first switch circuit; the first transistor The collector of is used as the same-direction output terminal of the first switch circuit;

The input terminal of the second switching device is used as the input terminal of the second switching circuit, and the output terminal of the second switching device is respectively connected to one end of the second pull-down resistor and the base of the second triode; the collector of the second triode is connected to The second pull-up resistor; the emitter of the second transistor and the other end of the second pull-down resistor are both grounded; the output end of the second switching device serves as the input end of the second switching circuit, and the output end of the second switching device serves as the first The reverse output end of the second switch circuit; the collector of the second triode serves as the same direction output end of the second switch circuit.

In one of the embodiments, the first switching device and the second switching device are optocouplers.

In one of the embodiments, the potential pull-up circuit includes a third transistor, a first Zener diode, a second Zener diode, and a third pull-down resistor;

The positive pole of the first Zener diode is connected to the emitter of the third transistor and the ground reference terminal of the first gate control module respectively; the negative pole of the first Zener diode is connected to the negative pole of the second Zener diode, and is used to connect to the DC high voltage source; the base of the third triode is respectively connected to the anode of the second Zener diode and one end of the third pull-down resistor; the other end of the third pull-down resistor and the collector of the third triode are both grounded.

In one of the embodiments, it further comprises a first diode and a second diode whose negative electrodes are connected to each other;

The anode of the first diode is connected to the same-direction output end of the first switch circuit; the anode of the second diode is connected to the same-direction output end of the second switch circuit; the cathodes of the first diode and the second diode are connected It is used as an external level signal source, and is connected to the respective second input terminals of the first gate circuit, the second gate circuit, the third gate circuit and the fourth gate circuit.

In one of the embodiments, it further includes a signal trigger, a fourth transistor and a third pull-up resistor;

The input end of the signal trigger is connected to the negative connection, and the output end of the signal trigger is connected to the base of the fourth triode; the emitter of the fourth triode is grounded, and the collector of the fourth triode is connected to the third pull-up The connection of one end of the resistor is connected to the second input end of the first gate circuit and the second gate circuit; the other end of the third pull-up resistor is connected to the DC high voltage source.

In one of the embodiments, it further includes a regulated power supply module for supplying power to the second gate control module, a reset circuit, a first resistor and a second resistor;

The regulated power supply module is connected to the voltage detection end of the reset circuit; one end of the first resistor is respectively connected to the reset end of the reset circuit, the second input end of the third gate circuit, the second input end of the fourth gate circuit, and the signal trigger. input end; the other end of the first resistor is respectively connected to one end of the second resistor and the negative terminal; the other end of the second resistor is grounded.

In one of the embodiments, an enabling circuit connected to the base of the fourth triode is also included.

In one embodiment, the present invention also provides an electrical device, comprising a cooling and preheating driving control circuit, and a TEC cooling and preheating control module connected to the cooling and preheating driving control circuit.

In one of the embodiments, the TEC cooling and preheating control module includes a first filter circuit connected to the cold end of the TEC cooling and preheating control module, and a second filter circuit connected to the hot end of the TEC cooling and preheating control module.

The refrigeration and preheating drive control circuit and electrical equipment provided by the present utility model have at least the following technical effects:

In the refrigeration and preheating drive control circuit and electrical equipment of the utility model, the input ends of the first switch circuit and the second switch circuit are used for connecting external level signals opposite to each other. The input end of the first door control module is respectively connected to the first switch circuit and the second switch circuit, and the input end of the second door control module is also connected to the first switch circuit and the second switch circuit respectively. The output ends of the first door control module and the second door control module are connected to the TEC refrigeration and preheating control module. At the same time, the ground reference terminal of the first gate control module is also connected with a potential pull-up circuit, and the power terminal is used for connecting a DC high voltage source. Therefore, each embodiment of the present invention can be based on the first door control module and the second door control module, combined with the first switch circuit and the second switch circuit, which not only improves the response speed of cooling and preheating. At the same time, the potential potential of the ground reference terminal of the first gate control module is raised by the potential pulling circuit, and the external DC high voltage source is used to enhance the driving capability of the TEC refrigeration and preheating control module. The embodiment of the utility model has a simple circuit structure and a high degree of integration, can achieve rapid heating and cooling, and can be applied to most electrical equipment, especially high-power electrical equipment.

Description of drawings

1 is a schematic structural diagram of a refrigeration and preheating drive control circuit in an embodiment of the present invention;

2 is another schematic structural diagram of a refrigeration and preheating drive control circuit in an embodiment of the present invention;

3 is a schematic structural diagram of a first switch circuit of a cooling and preheating drive control circuit in an embodiment of the present invention;

4 is a schematic structural diagram of a second switch circuit of a cooling and preheating drive control circuit in an embodiment of the present invention;

5 is another schematic structural diagram of the first switch circuit of the cooling and preheating drive control circuit in an embodiment of the present invention;

6 is another schematic structural diagram of the second switch circuit of the cooling and preheating drive control circuit in an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a potential pull-up circuit of a cooling and preheating drive control circuit in an embodiment of the present invention;

8 is a schematic structural diagram of an external level signal source in a cooling and preheating drive control circuit according to an embodiment of the present invention;

9 is another schematic structural diagram of a refrigeration and preheating drive control circuit in an embodiment of the present invention;

10 is another schematic structural diagram of a refrigeration and preheating drive control circuit in an embodiment of the present invention;

11 is another schematic structural diagram of a refrigeration and preheating drive control circuit in an embodiment of the present invention;

12 is another schematic structural diagram of a refrigeration and preheating drive control circuit in an embodiment of the present invention;

13 is a schematic structural diagram of a regulated power supply module of a refrigeration and preheating drive control circuit in an embodiment of the present invention;

14 is a schematic structural diagram of a reset circuit of a cooling and preheating drive control circuit in an embodiment of the present invention;

15 is a schematic structural diagram of an enabling circuit in a refrigeration and preheating drive control circuit according to an embodiment of the present invention;

16 is another schematic structural diagram of the enabling circuit in the cooling and preheating drive control circuit in an embodiment of the present invention;

17 is a schematic structural diagram of an electrical device in an embodiment of the present invention;

18 is a schematic structural diagram of a TEC refrigeration and preheating control module of an electrical device in an embodiment of the present invention.

Detailed ways

Hereinafter, various embodiments of the present invention will be described more fully. The present invention may have various embodiments, and adjustments and changes may be made therein. It should be understood, however, that there is no intention to limit the scope of protection of the present invention to the specific embodiments disclosed herein, but rather that the present invention should be understood to encompass those falling within the spirit and scope of various embodiments of the present invention. All adjustments, equivalents and/or alternatives.

Hereinafter, the terms "comprising" or "may include" as may be used in various embodiments of the present invention indicate the presence of a disclosed function, operation or element and do not limit one or more functions, operations or elements increase. Furthermore, as used in various embodiments of the present invention, the terms "comprising", "having" and their cognates are only intended to mean a particular feature, number, step, operation, element, component, or combination of the foregoing , and should not be construed as first excluding the presence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing or adding one or more features, numbers, steps, operations, elements, Possibility of components or combinations of the foregoing.

In various embodiments of the invention, the expression "at least one of A or/and B" includes any and all combinations of the words listed at the same time. For example, the expressions "A or B" or "at least one of A or/and B" may include A, may include B, or may include both A and B.

Expressions (such as "first", "second", etc.) used in the various embodiments of the present invention may modify various constituent elements in the various embodiments, but may not limit the corresponding constituent elements. For example, the above expressions do not limit the order and/or importance of the elements. The above expressions are only used for the purpose of distinguishing one element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.

It should be noted that if a constituent element is described as being "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and the "connection" between the first constituent element and the second constituent element may be "The third component. On the contrary, when one constituent element is "directly connected" to another constituent element, it can be understood that the third constituent element does not exist between the first constituent element and the second constituent element.

The term "user" as used in various embodiments of the present invention may refer to a person using an electronic device or a device using the electronic device (eg, an artificial intelligence electronic device).

The terms used in the various embodiments of the present invention are for the purpose of describing particular embodiments only and are not intended to limit the various embodiments of the present invention. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of this invention belong. Terms (such as those defined in commonly used dictionaries) are to be interpreted as having the same meaning as in the context of the relevant technical field and shall not be interpreted as having an idealized or overly formal meaning unless in The various embodiments of the present invention are clearly defined.

Referring to FIG. 1, in one embodiment, the present invention provides a refrigeration and preheating drive control circuit, including: a first switch circuit 110, a second switch circuit 120, a first door control module 130, a second door control module Module 150 and potential pull-up circuit 140 .

The input terminals IN1 and IN2 of the first switch circuit 110 and the second switch circuit 120 are used to access external level signals opposite to each other; the first gate control module 130 includes a first gate circuit 130a and a second gate circuit 130b; The two-gate control module 150 includes a third gate circuit 150a and a fourth gate circuit 150b.

The non-inverting output terminal of the first switch circuit 110 is connected to the first input terminal 1A of the first gate circuit, and the reverse output terminal of the first switch circuit is connected to the first input terminal 3A of the third gate circuit.

The non-inverting output terminal of the second switch circuit 120 is connected to the first input terminal 2A of the second gate circuit, and the reverse output terminal of the second switch circuit is connected to the first input terminal 4A of the fourth gate circuit.

The ground reference terminal of the first gate control module 130 is connected to the potential pull-up circuit 140 , and the power terminal of the first gate control module 130 is used to connect to the DC high voltage source 160 .

The respective second input terminals 1B, 2B, 3B and 4B of the first gate circuit 130a, the second gate circuit 130b, the third gate circuit 150a and the fourth gate circuit 160a are respectively used to connect the external level signal source 180; the first gate circuit The output terminals of the circuit 130 a , the second gate circuit 130 b , the third gate circuit 150 a and the fourth gate circuit 150 b are used to connect to the TEC cooling and preheating control module 170 .

As shown in FIG. 3 , the embodiment of the present invention can be applied to a TEC (Thermo Electric Cooler) refrigeration and preheating control module 170 in the prior art used in electrical equipment, which includes four switching tubes, such as two P-type The MOS switch tubes form a set of upper arm switch tubes Q11 and Q12, and the other two N-type MOS switch tubes form a set of lower arm switch tubes Q13 and Q14. By turning on the corresponding switch tubes on the diagonal, the cooling of the TEC refrigerator can be changed. Cooling or preheating is realized by the current flow of terminal 1 and hot terminal 2, and the principles of preheating and cooling are not repeated here.

The first door control module 130 controls a group of switch tubes of the TEC refrigeration and preheating control module 170, such as the upper arm switch tubes, and the second door control module 150 controls the lower arm switch tubes. Because according to the TEC refrigeration and preheating control module 170 turns on and off the diagonal switch tubes to change the current direction of the cold end 1 and the hot end 2 of the TEC refrigerator, so as to realize the working principle of cooling and preheating. Therefore, in order to improve the driving capability, preferably, the ground reference terminal of the first gate control module 130 that controls a group of upper-arm switch tubes is not directly grounded and not at zero potential, but is connected to the potential pull-up circuit 140, Thereby increasing the common reference potential of the circuit. At the same time, the power supply terminal is connected to the DC high voltage source 160, so as to raise the potential level of the ground reference terminal of the first door control module 130, so as to adapt to the high-power electrical equipment and satisfy the driving of the TEC refrigeration and preheating control module 170 of the high-power electrical equipment. ability. Further, since the first door control module 130 and the second door control module 150 are controlled by digital logic, the driving capability is relatively large, the response speed is fast, and the integration is easy. The embodiment of the present utility model can drive the cooling and preheating of the high-power electrical equipment as a whole, so as to rapidly increase the temperature and decrease the temperature.

Further, in order to ensure that the switch tubes on one pair of corners can be turned on, and the switch tubes on the other corner are disconnected, therefore, the input ends of the first switch circuit 110 and the second switch circuit 120 are opposite to each other for access. the external level signal. The non-inverting output terminal of the first switch circuit 110 is connected to the first input terminal 1A of the first gate circuit 130a, and the inverting output terminal of the first switch circuit 110 is connected to the first input terminal 3A of the third gate circuit 150a. The non-inverting output terminal of the second switch circuit 120 is connected to the first input terminal 2A of the second gate circuit 130a, and the inverting output terminal of the second switch circuit 120 is connected to the first input terminal 4A of the fourth gate circuit 150b. And the second input terminals 1B, 2B, 3B, 4B of the first gate circuit 130a, the second gate circuit 130b, the third gate circuit 150a and the fourth gate circuit 150b are kept at a high level by connecting the external level signal source 180 state or low state. Further, when the respective output terminals of the first gate circuit 130a, the second gate circuit 130b, the third gate circuit 150a and the fourth gate circuit 150b are connected to the input terminals of the switch tubes corresponding to the TEC refrigeration and preheating control module 170, according to The digital logic control principle can realize the conduction or closing of the switch tubes on the corresponding diagonal corners, thereby changing the current direction of the cold end 1 and the hot end 2 of the load TEC refrigerator to achieve heating or cooling. The first gate control module 130 and the second gate control module 150 may include a NAND gate module or an AND gate module, that is, the gate control modules that the first gate control module 130 and the second gate control module 150 may include may both be AND gates Not gate modules, or both are AND gate modules, or one is a NAND gate module and one is an AND gate module.

The voltage range of the DC high voltage source 160 is 24V-36V, preferably 24V. The first switch circuit 110 and the second switch circuit 120 may include any one of a photocoupler or a PNP transistor.

For example, the first gate control module 130 in the embodiment of the present invention includes a NAND gate module U3, such as 74HC00, the second gate control module 150 includes an AND gate module U4, such as 74HC08, and the external level signal source 180 sends the second gate module U3 to the NAND gate module U3. The second input terminal 1B of a gate circuit, the second input terminal 2B of the second gate circuit, and the second input terminal 3B of the third gate circuit and the second input terminal 4B of the fourth circuit in the AND gate module U4 provide high level signal. The ground reference terminal of the NAND gate module U3 is connected to the potential pull-up circuit 140, and the power supply terminal is connected to the DC high voltage source 160, so as to improve the driving capability of the NAND gate module U3. The DC high voltage source is 24V DC. The output terminal 1Y of the first gate circuit in the NAND gate module U3 is connected to the upper arm switch tube Q12 of the TEC refrigeration and preheating control module, the output terminal 2Y of the second gate circuit is connected to the upper arm switch tube Q11, and the third gate circuit in the AND gate module U4 is connected to the upper arm switch tube Q12. The output terminal 3Y of the gate circuit is connected to the lower arm switch tube Q14, and the output terminal 4Y of the fourth gate circuit is connected to the lower arm switch tube Q13.

When the heating of the TEC cooling and preheating control module is started, for example, the input terminal of the NAND gate module U3 is given a high level, and the input terminal of the AND gate module U4 is a low level. At this time, the first switch circuit 110 is not turned on, and the second switch circuit 120 is turned on. The non-directional output terminal of the first switch circuit 110 outputs a high level, and the reverse output terminal outputs a low level; the non-directional output terminal of the second switch circuit 120 outputs a low level, and the reverse output terminal outputs a high level. Therefore, the first input terminal 1A of the first gate circuit in the NAND gate module U3 is at a high level, the first input terminal 2B of the second gate circuit is at a low level, and the first input terminal of the third gate circuit in the AND gate module U4 is at a low level. The input terminal 3A is at a low level, and the first input terminal 4A of the fourth gate circuit is at a high level. Since the second input terminal 1B of the first gate circuit, the second input terminal 2B of the second gate circuit, the second input terminal 3B of the third circuit, and the second input terminal 4B of the fourth gate circuit provide high-level signals , therefore, the output terminal 1Y of the first gate circuit of the NAND gate module U3 outputs a low level, and the output terminal 2Y of the second gate circuit outputs a high level; while the output terminal 3Y of the third gate circuit of the AND gate module U4 outputs a low level level, the output terminal 4Y of the fourth gate circuit outputs a high level. Therefore, at this time, Q11 and Q14 are turned on, Q12 and Q13 are not turned on, the current flows from the cold end 1 to the hot end 2, and the TEC refrigerator starts to heat.

When the cooling of the TEC cooling and preheating control module is started, for example, the input terminal of the NAND gate module U3 is given a low level, and the input terminal of the AND gate module U4 is a high level. At this time, the first switch circuit 110 is turned on, and the second switch circuit 120 is turned off. The non-directional output terminal of the first switch circuit 110 outputs a low level, and the reverse output terminal outputs a high level; the non-directional output terminal of the second switch circuit 120 outputs a high level, and the reverse output terminal outputs a low level. Therefore, the first input terminal 1A of the first gate circuit in the NAND gate module U3 is at a low level, the first input terminal 2A of the second gate circuit is at a high level, and the first input terminal of the third gate circuit in the AND gate module U4 is at a high level. The input terminal 3A is at a high level, and the first input terminal 4A of the fourth gate circuit is at a low level. Since the second input terminal 1B of the first gate circuit, the second input terminal 2B of the second gate circuit, the second input terminal 3B of the third circuit, and the second input terminal 4B of the fourth gate circuit provide high-level signals , therefore, the output terminal 1Y of the first gate circuit of the NAND gate module U3 outputs a high level, and the output terminal 2Y of the second gate circuit outputs a low level; while the output terminal 3Y of the third gate circuit of the AND gate module U4 outputs a high level The output terminal 4Y of the fourth gate circuit outputs a low level. Therefore, at this time, Q11 and Q14 are not conducting, Q12 and Q13 are conducting, the current flows from the hot end 2 to the cold end 1, and the TEC refrigerator starts to cool.

In the refrigeration and preheating drive control circuit of the present invention, the input ends of the first switch circuit 110 and the second switch circuit 120 are used to connect external level signals that are opposite to each other. The input terminals of the first gate control module 130 are connected to the first switch circuit 110 and the second switch circuit 120 respectively, and the input terminals of the second gate control module 150 are also connected to the first switch circuit 110 and the second switch circuit 120 respectively. The output terminals of the first door control module 130 and the second door control module 150 are connected to the TEC cooling and preheating control module 170 . At the same time, the ground reference terminal of the first gate control module 130 is also connected to the potential pulling circuit 140 , and the power terminal is used to connect the DC high voltage source 160 . Therefore, the embodiment of the present invention can be based on the first door control module 130 and the second door control module 150, combined with the first switch circuit 110 and the second switch circuit 120, which not only improves the response speed of cooling and preheating. At the same time, the potential of the ground terminal of the first door control module 130 is pulled up by the potential pull-up circuit 140 and the external DC high voltage source 160 is used to enhance the driving capability of the TEC cooling and preheating control module 170 . The embodiment of the utility model has a simple circuit structure and a high degree of integration, can achieve rapid heating and cooling, and can be applied to most electrical equipment, especially high-power electrical equipment.

Referring to FIG. 1 , FIG. 3 and FIG. 4 , in a specific embodiment, the first switch circuit includes a first switch device T1 , a first transistor Q1 , a first pull-down resistor R11 and a first pull-up resistor R12 .

The second switch circuit includes a second switch device T2, a second transistor Q2, a second pull-down resistor 21 and a second pull-up resistor R22.

The output end of the first switching device T1 is respectively connected to one end of the first pull-down resistor R11 and the base of the first transistor Q1; the collector of the first transistor Q1 is connected to the first pull-up resistor R12; The emitter of the transistor Q1 and the other end of the first pull-down resistor R11 are grounded; the input end of the first switching device T1 serves as the input end IN1 of the first switching circuit, and the output end of the first switching device T1 serves as the inverse of the first switching circuit. To the output end; the collector of the first transistor Q1 serves as the same-direction output end of the first switch circuit.

The output terminal of the second switching device T2 is respectively connected to one end of the second pull-down resistor R21 and the base of the second transistor Q2; the collector of the second transistor Q2 is connected to the second pull-up resistor R22; The emitter of Q2 and the other end of the second pull-down resistor R21 are grounded; the input end of the second switching device T2 serves as the input end of the second switching circuit, and the output end of the second switching device T2 serves as the inverse of the second switching circuit Output terminal; the collector of the second transistor Q2 is used as the non-inverting output terminal of the second switch circuit.

For example, as shown in FIG. 2 , the first gate control module is the NAND gate module U3, the second gate control module is the AND gate module U4, and the external level signal source 180 provides a high level, wherein, in the NAND gate module U3 The output terminal 1Y of the first gate circuit is connected to the upper arm switch tube Q12 of the TEC refrigeration and preheating control module 170, and the output terminal 2Y of the second gate circuit is connected to the upper arm switch tube Q11, and is connected to the output terminal 3Y of the third gate circuit in the gate module U4. The lower arm switch tube Q14, the output end 4Y of the fourth gate circuit is connected to the lower arm switch tube Q13. As shown in FIG. 3 and FIG. 4 , the first switching device T1 and the second switching device T2 may be photocouplers or PNP transistors. When the first switching device is a PNP triode, its base acts as the input terminal IN1 of the first switching circuit, and the collector acts as the reverse output terminal IO1; when the second switching device is a PNP triode, its base acts as the second switching circuit The input terminal IN2, the collector as the reverse output terminal IO2. When the first switching device is an optocoupler, the negative electrode of the incident terminal is used as the input terminal IN1 of the first switching circuit, and the emitter is used as the reverse output terminal IO1. When the second switching device is an optocoupler, the negative electrode of the incident terminal is used as the input terminal IN2 of the second switching circuit, and the emitter is used as the reverse output terminal IO2.

When the heating of the TEC cooling and preheating control module is started, for example, the input terminal IN1 of the first door control module is at a high level, and the input terminal IN2 of the second door control module is at a low level. The first switching device T1 is turned off, and the second switching device T2 is turned on. The output terminal IO1 of the first switching device T1 pulls down the potential due to the first pull-down resistor R11 and outputs a low level to the first input terminal 3A of the third gate circuit, and the first transistor Q1 is not turned on, the first gate The potential of the first input terminal 1A of the circuit is pulled up to a high level by the first pull-up resistor R12 of the collector of the first transistor Q1. The output terminal IO2 of the second switching device T2 outputs a high level to the first input terminal 4A of the fourth gate circuit, and the second transistor Q2 is turned on, and the collector of the turned-on second transistor Q2 will The potential of the first input terminal 2A of the two-gate circuit is pulled down to a low level. Therefore, as shown in Figure 2, the output terminal 1Y of the first gate circuit of the NAND gate module U3 outputs a low level, and the output terminal 2Y of the second gate circuit outputs a high level; while the third gate circuit of the AND gate module U4 outputs a high level. 3Y outputs a low level, and the output terminal 4Y of the fourth gate circuit outputs a high level. Therefore, at this time, Q11 and Q14 are turned on, Q12 and Q13 are not turned on, the current flows from the cold end 1 to the hot end 2, and the TEC refrigerator starts to heat.

When the cooling of the TEC cooling and preheating control module is started, for example, the input terminal IN1 of the first door control module is given a low level, and the input terminal IN2 of the second door control module is at a high level. The first switching device T1 is turned on, and the second switching device T2 is turned off. The output terminal IO1 of the first switching device T1 outputs a high level to the first input terminal 3A of the third gate circuit, and the first transistor Q1 is turned on, and the collector of the turned-on first transistor Q1 turns the first transistor Q1 on. The potential of the first input terminal 1A of the gate circuit is pulled down to a low level. The output terminal IO2 of the second switching device T2 is pulled down by the second pull-down resistor R21 to output a low level to the first input terminal 4A of the fourth gate circuit, and the second transistor Q2 is not turned on, the second gate circuit The potential of the first input terminal 2A of the second transistor Q2 is pulled up to a high level by the second pull-up resistor R22 at the collector of the second transistor Q2. Therefore, as shown in Figure 2, the output terminal 1Y of the first gate circuit of the NAND gate module U3 outputs a high level, and the output terminal 2Y of the second gate circuit outputs a low level; while the third gate circuit of the AND gate module U4 outputs a low level. 3Y outputs a high level, and the output terminal 4Y of the fourth gate circuit outputs a low level. Therefore, at this time, Q11 and Q14 are not conducting, Q12 and Q13 are conducting, the current flows from the hot end 2 to the cold end 1, and the TEC refrigerator starts to cool.

The first switch circuit further includes current limiting resistors Ra and Rb, and the other end of the first pull-up resistor R12 is connected to the external power supply VCC. The second switch circuit further includes current limiting resistors Rc and Rd, and the other end of the second pull-up resistor R22 is connected to the external power supply VCC.

In the refrigeration and preheating drive control circuit of the embodiment of the present invention, the first switch circuit and the second switch circuit respectively include a switch device, a triode, a pull-down resistor and a pull-up resistor. , can realize the same direction output and reverse output, so as to realize the digital logic control of each gate circuit in the first door control module and the second door control module, so as to realize the diagonal connection of the switch tube in the TEC refrigeration and preheating control module. break control. At the same time, the triodes in the first switch circuit and the second switch circuit can amplify the weak signal to the large value signal, which further helps to increase the driving capability of the circuit. The circuit structure of the embodiment of the utility model is relatively complete, the integration degree is high, and the cost is low, which helps to improve the driving capability while ensuring the stable control of the first door control module and the second door control module.

Referring to FIG. 5 and FIG. 6 , in a specific embodiment, the first switching device and the second switching device are optocouplers.

The negative pole of the incident end of the optocoupler U6 is used as the input terminal IN1 of the first switch circuit, and the emitter is connected to one end of the first pull-down resistor R11 and the base of the first transistor Q1, and is used as the reverse output of the first switch circuit. Terminal IO1. The negative electrode of the optocoupler U7 is used as the input terminal of the second switch circuit, and the emitter is connected to one end of the second pull-down resistor R21 and the base of the second transistor Q2, and is used as the reverse output terminal IO2 of the second switch circuit. .

In the refrigeration and preheating drive control circuit of the embodiment of the present invention, the first switch circuit and the switch circuit include a photocoupler, which plays the role of isolation protection. It can prevent the interference caused by the high power output of the load, so that the input and output can be completely isolated. The embodiment of the utility model improves the reliability of the circuit while being able to drive the high-power load electrical equipment.

Preferably, the current limiting resistors Rf and Rg can be increased to improve the reliability of the circuit.

Referring to FIG. 1 and FIG. 7 , in a specific embodiment, the potential pull-up circuit includes a third transistor Q3 , a first Zener diode D1 , a second Zener diode D2 and a third pull-down resistor R31 .

The anode of the first Zener diode D1 is respectively connected to the emitter of the third transistor Q3 and the ground reference terminal GND of the first gate control module 130, and the cathode of the first Zener diode D1 is connected to the cathode of the second Zener diode D2, And used to connect to the DC high voltage source 160; the base of the third transistor Q3 is respectively connected to the anode of the second Zener diode D2 and one end of the third pull-down resistor R31; the other end of the third pull-down resistor R3 and the third The collectors of the transistor Q3 are all grounded.

The third transistor Q3 is a PNP transistor. The third transistor Q3 is turned on under the pull-down of the third pull-down resistor R3, and the second Zener diode D2 ensures that the base of the third transistor Q3 is kept at a high potential voltage, while the first Zener diode D1 also It is ensured that the turned-on emitter of the third transistor Q3 is kept at a high potential voltage. Therefore, the third transistor Q3 can pull up the potential level of the ground reference terminal GND of the first gate control module 130 through the first Zener diode D1 and the second Zener diode D2, so as to cooperate with the external DC high voltage source 160 to improve driving. ability. Further, the parameters of the Zener diode and the third pull-down resistor R31 can be determined according to the actual circuit design, so that the potential of the ground reference terminal GND of the first gate control module 130 is pulled up. Further, filter capacitors Ca and Cb are also included.

For example, as shown in FIG. 2 , the first gate control module 130 includes a NAND gate module U3 such as a 74HC00. Preferably, the resistance of the third pull-down resistor R31 is 5.6KΩ, the first voltage regulator diode D1 and the second voltage regulator Diode D2 is a 6.2V Zener diode. Therefore, the third transistor Q3 is turned on under the pull-down of the third pull-down resistor R31, the second Zener diode D2 stabilizes the base voltage of the third transistor Q3 at 6.2V, and the first Zener diode D1 also ensures The emitter of the turned-on third transistor Q3 is stable between 6.2-17.8V.

In the cooling and preheating drive control circuit of the embodiment of the present invention, the potential pull-up circuit 140 includes a third transistor Q3, a first Zener diode D1, a second Zener diode D2 and a third pull-down resistor R31. Its circuit structure It is simple and easy to implement, and effectively raises the potential of the reference terminal of the ground terminal of the first door control module 130, thereby improving the driving capability. Therefore, the embodiments of the present invention can be applied to electrical equipment with high power loads to drive the TEC cooling and preheating control module 170 of the electrical equipment with high power loads.

Referring to FIG. 1 and FIG. 8 , in a specific embodiment, it further includes two first diodes D11 and second diodes D22 whose negative electrodes are connected to each other.

The anode of the first diode D11 is connected to the same-direction output end of the first switch circuit 110; the anode of the second diode D22 is connected to the same-direction output end of the second switch circuit 120; the first diode D11 and the second two The negative connection point of the pole tube D22 serves as the external level signal source 180, and is connected to the respective second input terminals of the first gate circuit, the second gate circuit, the third gate circuit and the fourth gate circuit.

Since the output terminals of the first switch circuit 110 and the second switch circuit 120 are used to access external level signals opposite to each other, the cathodes of the first diode D11 and the second diode D22 are both at a high level , so that the anode connection of the first diode D11 and the second diode D22 is used as the external level signal source 180 . The negative connection is connected to the respective second input terminals of the first gate circuit, the second gate circuit, the third gate circuit and the fourth gate circuit, so as to maintain a high level state.

The refrigeration and preheating drive control circuit of the embodiment of the present invention uses the first diode D11 and the second diode D22 as the external level signal source 180, and is the first door control module 130 and the second door control module 150. The level signal is provided, thereby helping to realize high-power cooling and preheating driving in conjunction with the potential pull-up circuit 140 .

As shown in FIG. 9, preferably, the first gate control module includes a NAND gate module U3, the second gate control module includes an AND gate control module U4, the first switching device is a photocoupler U6, and the second switching device is a photocoupler U7. Then the anode of the first diode D11 is connected to the emitter of the optocoupler U6; the anode of the second diode D22 is connected to the emitter of the optocoupler U7; the cathodes of the first diode D11 and the second diode D22 The connection point is used as an external level signal source, and is connected to the respective second input terminals 1B, 2B, 3B and 4B of the first gate circuit, the second gate circuit, the third gate circuit and the fourth gate circuit.

Referring to FIG. 10, in a specific embodiment, a signal flip-flop 10, a fourth transistor Q4 and a third pull-up resistor R32 are further included.

The input end of the signal trigger 10 is connected to the negative connection, and the output end of the signal trigger 10 is connected to the base of the fourth transistor Q4; the emitter of the fourth transistor Q4 is grounded, and the collector of the fourth transistor Q4 The connection with one end of the third pull-up resistor R3 is connected to the second input terminals 1B and 2B of the first gate circuit 130a and the second gate circuit 130b; the other end of the third pull-up resistor R32 is connected to a DC high voltage source.

The signal flip-flop 10 can be a NAND gate chip or a PNP transistor. As shown in FIG. 11 , if the signal trigger is a NAND gate chip U5, the two input terminals 5A and 5B of one of the gate circuits are connected to the negative terminal, and the output terminal 5Y is connected to the base of the fourth transistor Q5. Since the connection between the cathodes of the first diode D11 and the second diode D22 is a high level signal, the output terminal 5Y of the NAND gate chip U5 outputs a low level to the base of the fourth transistor Q4, The fourth transistor Q4 is not turned on, and the potential of the second input terminal 1B of the first gate circuit 130a is pulled up to a high level by the third pull-up resistor R32. If the signal trigger is a PNP transistor, the base is connected to the negative connection, and the collector is connected to the base of the fourth transistor Q4. Since the connection between the negative electrodes of the first diode D11 and the second diode D22 is a high level signal, the PNP transistor is not conducting, the fourth transistor Q4 is not conducting, and the first input terminal of the first gate circuit is not conducting. The 2B potential is pulled up to a high level by the third pull-up resistor R32.

In the cooling and preheating drive control circuit of the embodiment of the present invention, the negative poles of the first diode D11 and the second diode D22 are connected to The level signal output by the external level signal source at the connection is output to the first gate control circuit. Its circuit structure is relatively complete. The signal trigger 10 and the fourth transistor Q4 realize the output of a signal with a large amplitude to the first gate control module, which helps to improve the driving ability through the control of the signal with a large amplitude. A door control module enables the first door control module to stably drive the TEC cooling and preheating driving circuits.

Referring to FIG. 12 , in a specific embodiment, it further includes a regulated power supply module 20 for supplying power to the second gate control module, a reset circuit 30 , a first resistor R1 and a second resistor R2 .

The regulated power supply module 20 is connected to the voltage detection terminal of the reset circuit 30; one end of the first resistor R1 is respectively connected to the reset terminal of the reset circuit 30, the second input terminal 3B of the third gate circuit 150a, and the second input of the fourth gate circuit 150b. Terminal 4B and the input terminal of the signal trigger 10, the other end of the first resistor R1 is respectively connected to one end of the second resistor R2 and the negative connection; the other end of the second resistor R2 is grounded.

The regulated power supply module 20 provides a DC low voltage power supply to the second gate circuit module, and outputs a fault signal to the voltage detection terminal of the reset circuit 30 when overvoltage or overcurrent occurs. At this time, the reset terminal of the reset circuit 30 outputs a low-level reset signal, and the high-level signal at the connection between the negative electrodes of the first diode D11 and the second diode D22 is affected by the reset signal through the first resistor R1 and The voltage division of the second resistor R2 is pulled down. Therefore, the second input terminals 3B and 4B of the third gate circuit 150a and the fourth gate circuit 150b of the second gate control module are at low level. At the same time, the input terminal of the signal flip-flop 10 is turned into a low level state, the output terminal outputs a high level, the fourth transistor Q4 is turned on, and the collector of the fourth transistor Q4 is at a low level. At this time, the first gate The second input terminals of the first gate circuit 130a and the second gate circuit 130b of the control module are at a low level. Because, during normal operation, the external level signals output to the second input terminals 1B, 2B, 3B, 4B of the first gate circuit 130a, the second gate circuit 130b, the third gate circuit 150a and the fourth gate circuit 150b are high level, by switching the level signals of the respective first input terminals to achieve cooling and heating. When a fault such as overvoltage or overcurrent occurs, due to the reset signal of the reset circuit 30, the level of the external level signal provided to the second input terminal of each gate circuit is turned to a low level, and the first input terminal of each gate circuit is turned to a low level. The terminal also changes accordingly, which makes the diagonal switch tube of the TEC refrigeration and preheating drive circuit fail to conduct, thereby stopping work and realizing the protection effect.

At this time, for example, the first door control module controls a group of switch tubes of the TEC refrigeration and preheating control module, such as the upper arm switch tubes, and the second door control module controls the lower arm switch tubes. The first gate control module includes a NAND gate module such as 74HC00, and the second gate control module includes an AND gate module 74HC08. When an overcurrent or overvoltage fault occurs, the output terminals 1Y and 2Y of the first gate circuit and the second gate circuit in the NAND gate module output high level, and the third gate circuit and the fourth gate circuit in the AND gate module The output terminals 3Y and 4Y output low level, so the TEC refrigeration and preheating drive circuit fails to conduct diagonally and stops working.

The refrigeration and preheating drive control circuit of the embodiment of the present invention has overvoltage and overcurrent protection, which further improves the reliability and safety of the circuit and prevents the devices in the circuit from being damaged.

Referring to FIG. 13, in a specific embodiment, the regulated power supply module includes a regulated voltage chip U2, a diode D3, a zener diode D4, a fuse F1, a capacitor C1, a resistor R4 and a resistor R29. The voltage output terminal OUT of the voltage regulator chip U2 is connected to the voltage detection terminal of the reset circuit and the power input terminal of the second gate control module. The input terminal IN of the voltage regulator chip U2 is connected to a power supply, such as an external DC high voltage source. Further, a light-emitting diode D5 is also included to serve as an indicator light.

Referring to FIG. 14, in a specific embodiment, the reset circuit includes a reset chip U9 and a diode D6, the ground terminal GND of the reset chip is grounded, the voltage detection terminal C is connected to the voltage output terminal of the regulated power supply module, and the reset terminal RET passes through the diode D6 is connected to the first resistor R1, the second input terminal 3B of the third gate circuit, the second input terminal 4B of the fourth gate circuit, and the input terminal of the signal trigger, so as to isolate and prevent backflow. Further, it also includes a resistor R40, a resistor R50 and a capacitor C8.

The refrigeration and preheating drive control circuit of the embodiment of the present invention has a relatively complete circuit structure, which helps to improve the reliability of the circuit.

Referring to FIG. 12 , in a specific embodiment, an enabling circuit 40 connected to the base of the fourth transistor Q4 is further included.

During normal operation, when a high-level signal is input to the enabling circuit, the fourth transistor is not turned on, so that the refrigeration and preheating driving control circuit of the embodiment of the present invention is enabled and kept in working state. Preferably, a PWM signal is input to the enabling circuit, and the input frequency range can be 0-10 kHz, and it can also be output at full load. The embodiments of the present invention can make the cooling and preheating drive control circuits work stably, and at the same time help to achieve adjustable power output, so that the speed of cooling or preheating can be adjusted according to usage requirements.

15 and FIG. 12 , further, the enabling circuit may include a photocoupler U1, further, a resistor R60 electrically connected to the positive input end of the optocoupler U1, a resistor R65 connected to the emitter, and a diode D9. The negative input terminal of the optocoupler U1 is used as the input terminal ENA of the enabling circuit, the emitter is connected to the fourth transistor Q4, and the positive input terminal and the collector are connected to an external power supply. During normal operation, when a high-level signal is input to the negative input terminal of the photocoupler U1, the fourth transistor Q4 is non-conductive, so that the refrigeration and preheating drive control circuits are enabled and kept in working state.

The refrigeration and preheating drive control circuit of the embodiment of the present invention further includes an enabling circuit, and the enabling circuit may include a photocoupler U1, so that it can play an isolation role while enabling and ensuring that it is in a working state. While satisfying high-power drive, the input and output are completely isolated, preventing faults from causing damage to the circuit, and helping to achieve adjustable power output.

12 and FIG. 16 , further, the enabling circuit may include a PNP transistor Q10, further, a resistor R70 and a resistor R75 connected to the base of the PNP transistor Q10, and a resistor R80 connected to the collector and a diode D10. The base of the PNP transistor Q10 is used as the input terminal ENA of the enabling circuit, and the collector is connected to the fourth transistor Q4. During normal operation, when a high-level signal is input to the base of the PNP transistor Q10, the fourth transistor Q4 is non-conductive, so that the refrigeration and preheating drive circuits are enabled and kept in working state.

The cooling and preheating drive control circuit of the embodiment of the present invention further includes an enabling circuit, and the enabling circuit may include a PNP transistor Q10, thus enabling and ensuring that it is in a working state, and helping to realize adjustable power output.

Referring to FIG. 1 and FIG. 17 , in one embodiment, the present invention further provides an electrical device, including a cooling and preheating driving control circuit 190 and a TEC cooling and preheating control module connected to the cooling and preheating driving control circuit 170.

The electrical equipment of the embodiments of the present invention may include, but is not limited to, laser treatment machines and LED lighting equipment. Preferably, the TEC refrigeration and preheating control module 170 in the embodiment of the present invention includes a set of upper arm P-type MOS transistors Q11 and Q12, and a set of lower arm N-type MOS transistors Q13 and Q14. The gate of the MOS transistor Q12 is connected to the output terminal 1Y of the first gate circuit, the gate of the MOS transistor Q11 is connected to the output terminal 2Y of the second gate circuit, the gate of the MOS transistor Q13 is connected to the output terminal 4Y of the fourth gate circuit, and the MOS transistor Q13 is connected to the output terminal 4Y of the fourth gate circuit. The gate of the transistor Q14 is connected to the output terminal 3Y of the third gate circuit. The sources of the MOS transistor Q11 and the MOS transistor Q12 are connected to the power supply. The sources of the MOS transistor Q13 and the MOS transistor Q14 are grounded. The drains of the MOS transistor Q11 and the MOS transistor Q13 are connected in series, and the drains of the MOS transistor Q12 and the MOS transistor Q14 are connected in series.

It should be noted that, for the refrigeration and preheating drive control circuit 190 in the embodiment of the present invention, reference may be made to the description of the limitations of the refrigeration and preheating drive control circuit in the above embodiments, which will not be repeated here.

The electrical equipment of the embodiment of the present invention includes a refrigeration and preheating drive control circuit 190 and a TEC refrigeration and preheating control module 170 . Among them, in the cooling and preheating drive control circuit 190, the input terminals of the first switch circuit and the second switch circuit are used to connect external level signals that are opposite to each other. The input end of the first door control module is respectively connected to the first switch circuit and the second switch circuit, and the input end of the second door control module is also connected to the first switch circuit and the second switch circuit respectively. The outputs of the first door control module and the second door control module are connected to the TEC cooling and preheating control module 170 . At the same time, the ground reference terminal of the first door control module is also connected to a potential pulling circuit, and the power terminal is used for connecting to a high-voltage DC source. Therefore, the embodiment of the present invention can be based on the first door control module and the second door control module, combined with the first switch circuit and the second switch circuit, which not only improves the response speed of cooling and preheating. At the same time, the potential of the ground terminal of the first gate control module is raised by the potential boost circuit, and the external DC high voltage source is used to enhance the driving capability of the TEC cooling and preheating control module 170 . The embodiment of the utility model has a simple circuit structure and a high degree of integration, can achieve rapid heating and cooling, and can be applied to most electrical equipment, especially high-power electrical equipment.

18 , in a specific embodiment, the TEC refrigeration and preheating control module includes a first filter circuit 60 connected to the cold end 1 of the TEC refrigeration preheating control module and a first filter circuit 60 connected to the hot end 2 of the TEC refrigeration preheating control module. Two filter circuits 70 .

The electrical equipment of the embodiment of the present invention has a simple circuit structure and is easy to implement. The first filter circuit 60 and the second filter circuit 70 can enhance the anti-interference ability and filtering ability of the electrical equipment.

Referring to FIG. 18 , a fuse F2 connected to the cold end 1 or the hot end 2 of the TEC refrigeration and preheating control module is also included, thereby further improving the reliability of the circuit.

Those skilled in the art can understand that the accompanying drawing is only a schematic diagram of a preferred implementation scenario, and the modules or processes in the accompanying drawing are not necessarily necessary to implement the present invention.

Those skilled in the art can understand that the modules in the device in the implementation scenario may be distributed in the device in the implementation scenario according to the description of the implementation scenario, or may be located in one or more devices different from the implementation scenario with corresponding changes. The modules of the above implementation scenarios may be combined into one module, or may be further split into multiple sub-modules.

The above serial numbers of the present invention are only for description, and do not represent the pros and cons of the implementation scenarios. The above disclosures are only a few specific implementation scenarios of the present invention, but the present invention is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims (10)

1. A refrigeration and preheating drive control circuit, characterized in that it includes: a first switch circuit, a second switch circuit, a first door control module, a second door control module, and a potential pull-up circuit; The input ends of the first switch circuit and the second switch circuit are used to access external level signals opposite to each other; the first gate control module includes a first gate circuit and a second gate circuit; the first gate circuit The two-gate control module includes a third gate circuit and a fourth gate circuit; The non-inverting output terminal of the first switch circuit is connected to the first input terminal of the first gate circuit, and the reverse output terminal of the first switching circuit is connected to the first input terminal of the third gate circuit; The non-directional output end of the second switch circuit is connected to the first input end of the second gate circuit, and the reverse output end of the second switch circuit is connected to the first input end of the fourth gate circuit; The ground reference terminal of the first door control module is connected to the potential pull-up circuit, and the power terminal of the first door control module is used for connecting to a DC high voltage source; The respective second input terminals of the first gate circuit, the second gate circuit, the third gate circuit and the fourth gate circuit are respectively used for connecting an external level signal source; the first gate circuit, The output ends of the second gate circuit, the third gate circuit and the fourth gate circuit are used for connecting to the TEC refrigeration and preheating control module. 2 . The refrigeration and preheating driving control circuit according to claim 1 , wherein the first switching circuit comprises a first switching device, a first triode, a first pull-down resistor and a first pull-up resistor. 3 . ; The second switch circuit includes a second switch device, a second transistor, a second pull-down resistor, and a second pull-up resistor; The output end of the first switching device is respectively connected to one end of the first pull-down resistor and the base of the first triode; the collector of the first triode is connected to the first pull-up resistor ; The emitter of the first transistor and the other end of the first pull-down resistor are both grounded; the input end of the first switch device is used as the input end of the first switch circuit, and the first switch The output terminal of the device is used as the reverse output terminal of the first switching circuit; the collector of the first transistor is used as the non-directional output terminal of the first switching circuit; The input end of the second switching device is used as the input end of the second switching circuit, and the output end of the second switching device is respectively connected to one end of the second pull-down resistor and the base of the second triode ; The collector of the second triode is connected to the second pull-up resistor; the emitter of the second triode and the other end of the second pull-down resistor are both grounded; The output terminal is used as the input terminal of the second switching circuit, the output terminal of the second switching device is used as the reverse output terminal of the second switching circuit; the collector of the second transistor is used as the the same-direction output end of the second switch circuit. 3 . The refrigeration and preheating driving control circuit according to claim 2 , wherein the first switching device and the second switching device are photocouplers. 4 . 4. The refrigeration and preheating drive control circuit according to claim 1, wherein the potential pull-up circuit comprises a third transistor, a first Zener diode, a second Zener diode and a third pull-down resistor ; The anode of the first Zener diode is respectively connected to the emitter of the third transistor and the ground reference terminal of the first gate control module; the cathode of the first Zener diode is connected to the second Zener The cathode of the diode is connected to the DC high voltage source; the base of the third triode is respectively connected to the anode of the second Zener diode and one end of the third pull-down resistor; the third The other end of the pull-down resistor and the collector of the third transistor are both grounded. 5. The refrigeration and preheating drive control circuit according to claim 1, further comprising a first diode and a second diode whose two negative electrodes are connected to each other; The anode of the first diode is connected to the same-direction output end of the first switch circuit; the anode of the second diode is connected to the same-direction output end of the second switch circuit; the first diode The connection between the tube and the negative electrode of the second diode is used as the external level signal source, and is connected with the first gate circuit, the second gate circuit, the third gate circuit and the fourth gate The respective second input terminals of the circuits are connected. 6. The refrigeration and preheating drive control circuit according to claim 5, further comprising a signal trigger, a fourth transistor and a third pull-up resistor; The input end of the signal trigger is connected to the negative connection, the output end of the signal trigger is connected to the base of the fourth triode; the emitter of the fourth triode is grounded, and the fourth triode is grounded. The connection between the collector of the quadrupole and one end of the third pull-up resistor is connected to the second input end of the first gate circuit and the second gate circuit; the other end of the third pull-up resistor One end is connected to the DC high voltage source. 7 . The refrigeration and preheating drive control circuit according to claim 6 , further comprising a regulated power supply module, a reset circuit, a first resistor and a second power supply for supplying power to the second door control module. 8 . resistance; The regulated power supply module is connected to the voltage detection end of the reset circuit; one end of the first resistor is respectively connected to the reset end of the reset circuit, the second input end of the third gate circuit, and the fourth gate the second input end of the circuit and the input end of the signal trigger; the other end of the first resistor is respectively connected to one end of the second resistor and the negative connection; the other end of the second resistor is grounded . 8 . The cooling and preheating driving control circuit according to claim 6 , further comprising an enabling circuit connected to the base of the fourth triode. 9 . 9 . An electrical device, characterized in that it comprises the cooling and preheating driving control circuit according to any one of claims 1 to 8 , and a TEC cooling and preheating control module connected to the cooling and preheating driving control circuit. 10 . 10. The electrical device according to claim 9, wherein the TEC refrigeration and preheating control module comprises a first filter circuit connected to a cold end of the TEC refrigeration and preheating control module, and a first filter circuit connected to the TEC refrigeration and preheating control module. A second filter circuit that preheats the hot end of the control module.

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