CN114326867A - Direct current load drive circuit, heating assembly and electrical equipment - Google Patents
Direct current load drive circuit, heating assembly and electrical equipment Download PDFInfo
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- CN114326867A CN114326867A CN202111681346.9A CN202111681346A CN114326867A CN 114326867 A CN114326867 A CN 114326867A CN 202111681346 A CN202111681346 A CN 202111681346A CN 114326867 A CN114326867 A CN 114326867A
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Abstract
The invention discloses a direct current load driving circuit, a heating assembly and electrical equipment, wherein the direct current load driving circuit comprises: a plurality of isolation circuits; the direct current load driving circuit comprises a plurality of direct current load driving branches, wherein the controlled end of each direct current load driving branch is respectively connected with a control signal, the grounding end of each direct current load driving branch is connected with a control ground through an isolation circuit and is connected with the negative pole end of a direct current power supply, and the output end of each direct current load driving branch is used for being connected with a direct current load. The invention solves the problem that the current flows back through the control ground loop to cause abnormal operation or burning of the circuit.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a direct-current load driving circuit, a heating assembly and electrical equipment.
Background
When the direct current load driving circuit drives a high-power load, a power supply mostly supplies power to each direct current load channel through a cable, and when the cable or the connector of the negative electrode of the power loop is disconnected, broken, poor in contact and the like, a circuit board for mounting electronic elements of the direct current load driving circuit is easy to work abnormally and even is burnt.
Disclosure of Invention
The invention mainly aims to provide a direct current load driving circuit, a heating assembly and electrical equipment, and aims to solve the problem that the circuit works abnormally or is burnt due to the backflow of current through a control ground loop.
In order to achieve the above object, the present invention provides a dc load driving circuit, which is applied to an electrical apparatus, wherein the electrical apparatus includes a plurality of dc loads connected in parallel; the DC load driving circuit includes:
a plurality of isolation circuits;
the direct current load driving circuit comprises a plurality of direct current load driving branches, a control signal is respectively connected to the controlled end of each direct current load driving branch, the grounding end of each direct current load driving branch is connected with a control ground through an isolation circuit and is connected with the negative pole end of a direct current power supply, and the output end of each direct current load driving branch is used for being connected with a direct current load.
Optionally, each of the isolation circuits includes a unidirectional conducting device, an input end of the unidirectional conducting device is connected to a ground end of the corresponding dc load driving branch, and an output end of the unidirectional conducting device is connected to a control ground.
Optionally, the unidirectional conducting device is a diode.
Optionally, the dc load driving circuit further includes:
the output ends of the main controller are connected with the controlled ends of the direct current load driving branches in a one-to-one correspondence manner;
the main controller is used for outputting a control signal to each direct current load driving branch circuit so as to control each direct current load driving branch circuit to drive the corresponding direct current load to work.
Optionally, the dc load driving circuit further includes a plurality of current detection circuits, each of the current detection circuits is serially connected between one of the dc load driving branches and the dc load, an output end of the current detection circuit is connected to the main controller, and the current detection circuit is configured to detect a current flowing through the corresponding dc load driving branch and output a current detection signal;
and the main controller is also used for controlling the corresponding direct current load driving branch circuit to work/stop working according to the current detection signal.
Optionally, each dc load driving branch includes a power switch tube and a pull-down resistor, the controlled end of the power switch tube is the controlled end of the dc load driving branch, the output end of the power switch tube is the output end of the dc load driving branch, the ground end of the power switch tube is the ground end of the dc load driving branch, and the pull-down resistor is serially connected between the controlled end of the power switch tube and the ground end.
Optionally, each of the dc load driving branches further includes a current-limiting resistor, one end of the current-limiting resistor is used for accessing a control signal, and one end of the current-limiting resistor is connected to the controlled end of the power switching tube.
The invention also provides a heating assembly, which comprises an electric control board, a plurality of direct current loads arranged in parallel and the direct current load driving circuit;
the direct current load driving circuit is arranged on the electric control board.
Optionally, a connector is further disposed on the electric control board, the heating assembly further includes a dc power supply, and the dc power supply is electrically connected to the dc load driving circuit and the dc load through the conductive member and the connector.
The invention also provides electrical equipment which comprises the direct current load driving circuit;
and/or include a heating assembly as above.
In the direct current load driving circuit, corresponding to a plurality of direct current load driving branches, an isolation circuit is arranged between the grounding end of each direct current load driving branch and the control ground in series, and each direct current load driving branch is isolated from each other under the isolation action of each isolation circuit, and the common ground of the control loops is realized through the isolation circuits. The isolation circuit can realize isolation between the grounding ends of the direct current load driving branches, so that when the grounding ends of the direct current load driving branches are in poor contact or open circuit with the negative electrode end of a direct current power supply, current on a power loop formed by the direct current load driving branches and a direct current load can be prevented from flowing into other power loops.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a functional block diagram of a dc load driving circuit according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a DC load driving circuit according to an embodiment of the present invention;
fig. 3 is a functional block diagram of another embodiment of the dc load driving circuit according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | Isolation circuit | Q1 | |
| 20 | DC load driving branch | R1 | Pull-down |
| 30 | Direct current power supply | R2 | Current-limiting |
| 40 | Main controller | SGND | |
| 100 | DC load | D1 | Unidirectional conducting device |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The invention provides a direct current load driving circuit, which is applied to electrical equipment, wherein the electrical equipment comprises a plurality of direct current loads 100 which are arranged in parallel.
In this embodiment, the dc load 100 may be a heating device, and the heating device may be correspondingly disposed in an electrical apparatus according to an electrical apparatus in practical application, for example, when the electrical apparatus is an electromagnetic oven, the heating device may be a heating coil, when the electrical apparatus is an electric oven, the heating device may be a metal heating tube, a quartz optical wave tube, or a glass heating surface, and when the electrical apparatus is an electric water heater, the heater may be a heating tube. These heating devices are usually driven by a dc load driving circuit to heat, and when the system power capacity is large or a plurality of high-power dc loads 100 are required to be output in parallel, in order to reduce the pressure of the switching devices and the line cables in the dc load driving circuit, a plurality of switching devices are usually driven in parallel, the cables are connected in parallel, and the heating devices are separately and independently controlled. In the actual current path in parallel with the multi-channel dc load 100, there will be a control signal loop and a power loop path; the high-power supply supplies power to each direct current load 100 channel through a plurality of cables, but the cathodes of the power loops cannot be isolated due to the existence of the control ground loop, namely, the cathodes of the power loops are grounded together. When the cable or the connector of the negative electrode of the power circuit is disconnected, poorly contacted and the like, the current on the channel with the open or poor contacted negative electrode can be shunted to the negative electrode circuit of other channels from the control ground circuit and flows back to the negative electrode of the power supply from other channels. At this time, the huge power loop current may cause abnormal operation of the circuit board on which the electronic components of the dc load driving circuit are mounted, or even burn out the circuit board.
In order to solve the above problem, the present invention provides a dc load driving circuit, referring to fig. 1 to 3, in an embodiment of the present invention, the dc load driving circuit includes:
a plurality of isolation circuits 10;
a plurality of dc load driving branches 20, a controlled terminal of each dc load driving branch 20 is respectively connected to a control signal, a ground terminal of each dc load driving branch 20 is connected to a control ground SGND through an isolation circuit 10, and is connected to a negative terminal of a dc power supply 30, and an output terminal of each dc load driving branch 20 is used for connecting to a dc load 100.
In this embodiment, a controlled terminal of each dc load driving branch 20 is connected to a control signal, a ground terminal of each dc load driving branch 20 is grounded via the isolation circuit 10, and each dc load driving branch 20 can be turned on/off at a corresponding frequency according to the received control signal. The control signal may be a PWM signal, a PAM signal, or the like. When each dc load driving branch 20 is turned on according to the received control signal, the control signal is grounded through the controlled terminal, the ground terminal and the isolation circuit 10 of the dc load driving branch 20, so as to form a ground control loop. Each isolation circuit 10 is disposed between the ground terminal of the corresponding dc load driving branch 20 and the control ground SGND, and the isolation circuit 10 has a characteristic of enabling a signal to flow in a single direction, that is, a control signal can flow back from the controlled terminal to the control ground SGND, without an interference signal flowing from the control ground SGND to the dc load driving branch 20. In this way, under the isolation action of the isolation circuits 10, the dc load driving branches 20 are isolated from each other, and the common ground of the control loop is realized through the isolation circuits 10.
Each dc load driving branch 20 drives one dc load 100, one end of each dc load 100 is connected in parallel and is connected to the positive terminal of the dc power supply 30, the other end of each dc load 100 is connected to the input terminal of one dc load driving branch 20, and the ground terminal of each dc load driving branch 20 is connected in parallel to the negative terminal of the dc power supply 30. When the corresponding dc load driving branch 20 is turned on according to the control signal, the current of the dc power supply 30 flows out from the positive terminal of the dc power supply 30 and flows back to the negative terminal of the dc power supply 30 through the dc load 100 and the dc load driving branch 20, so as to form a power loop for driving the dc load 100 to operate, so that the high-power dc power supply 30 can independently supply power to each channel of the dc load 100 through a plurality of cables. When the plurality of dc load driving branches 20 are simultaneously turned on, one end of each dc load 100 is connected in parallel to the positive terminal of the dc power supply 30, and the other end is connected in parallel to the negative terminal of the dc power supply 30 through the respective dc load driving branch 20, that is, the power loops formed by the dc load driving branches 20 are arranged in parallel in multiple channels. It will be appreciated that the negative terminals of the power loops cannot be isolated due to the presence of the control ground loop.
It should be noted that, because a large number of connectors and cables are often present in the multi-channel parallel circuit, and the connectors are prone to poor contact under the conditions of temperature change, aging, vibration, and the like, artificial installation errors may also occur in the connectors and cables for connecting the dc power supply 30, the dc loads 100, and the dc load driving branches 20. In a multi-channel parallel load scenario, when the outgoing line channel is open or in poor contact, for example, when the grounding end of one of the dc load driving branches 20 is in poor contact or open circuit with the negative terminal of the dc power supply 30 in the multiple dc load driving branches 20, and the current flowing out from the positive terminal of the dc power supply 30 passes through the dc load 100 and the one of the dc load driving branches 20, the current flows to the ground control loop through the isolation circuit 10 because the grounding end of the dc load driving branch 20 is electrically disconnected from the negative terminal of the dc power supply 30. At this time, since the grounding terminals of the other dc load driving branches 20 are also provided with the isolation circuit 10, the current flowing out of the open-circuit power loop cannot flow back to the negative terminal of the dc load 100 through the control ground SGND and the grounding terminals of the other dc load driving branches 20, so that the open-circuit power loop cannot generate current, and the risk of abnormal operation or burning of the circuit caused by the return of the current through the control ground loop is reduced.
In the dc load driving circuit of the present invention, corresponding to a plurality of dc load driving branches 20, an isolation circuit 10 is serially connected between a ground terminal of each dc load driving branch 20 and a control ground SGND, and each dc load driving branch 20 is isolated from each other under the isolation effect of the isolation circuit 10, and the common ground of the control loop is realized through the isolation circuit 10. The isolation circuit 10 of the present invention can realize isolation between the ground terminals of the dc load driving branches 20, so that when the ground terminals of the dc load driving branches 20 are in poor contact with the negative terminal of the dc power supply 30 or are open-circuited, it can prevent the current on the power loop formed by the dc load driving branches 20 and the dc load 100 from entering other power loops.
Referring to fig. 2, in an embodiment, each of the isolation circuits 10 includes a unidirectional conducting device D1, an input terminal of the unidirectional conducting device D1 is connected to the ground terminal of the corresponding dc load driving branch 20, and an output terminal of the unidirectional conducting device D1 is connected to the control ground SGND.
In this embodiment, the unidirectional conducting device D1 may be a diode. Each channel control ground loop is connected with a diode in series, so that a unidirectional signal path is formed between the grounding end of the direct current load driving branch 20 and the control ground SGND, when the grounding end of any direct current load driving branch 20 is in poor contact or is broken with the negative end of the direct current power supply 30, and the current flowing out from the positive end of the direct current power supply 30 passes through the direct current load 100 and the direct current load driving branch 20, because the grounding end of the direct current load driving branch 20 is disconnected from the electrical connection with the negative end of the direct current power supply 30, the current flows to the control ground loop through the diode, the current on the original channel power loop tries to flow through the diode of the channel to the control ground loop, and then seeks to reach the path of the negative end of the direct current power supply 30, at this time, because each direct current load driving branch 20 is provided with a diode which is in forward conduction and reverse cut off, the current can be blocked by the diodes of other channels, the power loop of the original channel can not generate current, and the potential risk of abnormal work or burning of the circuit board is reduced.
Referring to fig. 3, in an embodiment, the dc load driving circuit further includes:
a plurality of output ends of the main controller 40 are connected with the controlled ends of the plurality of dc load driving branches 20 in a one-to-one correspondence manner;
the main controller 40 is configured to output a control signal to each of the dc load driving branches 20, so as to control each of the dc load driving branches 20 to drive a corresponding dc load 100 to work.
In this embodiment, the main controller 40 may be implemented by a microprocessor such as a single chip microcomputer or a DSP, and those skilled in the art can control the dc load driving branch 20 by integrating some hardware circuits and software programs into the microprocessor. The main controller 40 can output a control signal with a corresponding frequency according to the requirement of a user to control the heating temperature of the dc load 100, so as to control the dc load driving branch 20 to output any power (average power).
Referring to fig. 1 to 3, in an embodiment, the dc load driving circuit further includes a plurality of current detection circuits, each of the current detection circuits is serially connected between one of the dc load driving branches 20 and the dc load 100, an output end of the current detection circuit is connected to the main controller 40, and the current detection circuit is configured to detect a current flowing through the corresponding dc load driving branch 20 and output a current detection signal;
the main controller 40 is further configured to control the corresponding dc load driving branch 20 to operate/stop according to the current detection signal.
In this embodiment, the current detection circuit may be implemented by using a current sensor, or may be implemented by using discrete components such as a sampling resistor. The current detection circuit is arranged in series on the power loop and used for detecting the current on the power loop and outputting a detected current detection signal to the main controller 40, when the main controller 40 determines that the current of the corresponding power loop is small, namely, the current is broken or poor in contact according to the current detection signal detected by the current detection circuit, the output of PWM (pulse width modulation) work to the direct current load driving branch circuit 20 connected in series on the power loop is stopped so as to break the electrical connection between the direct current load 100 corresponding to the power loop and the direct current power supply 30, a protection program is triggered through software or hardware logic of the main controller 40, and the direct current load 100 is closed so as to reduce the risk that the circuit works abnormally or is burnt due to the fact that the current flows back through the controlled loop.
Referring to fig. 2, in an embodiment, each of the dc load driving branches 20 includes a power switch Q1 and a pull-down resistor R1, the controlled terminal of the power switch Q1 is the controlled terminal of the dc load driving branch 20, the output terminal of the power switch Q1 is the output terminal of the dc load driving branch 20, the ground terminal of the power switch Q1 is the ground terminal of the dc load driving branch 20, and the pull-down resistor R1 is serially disposed between the controlled terminal and the ground terminal of the power switch Q1. Each of the dc load driving branches 20 further includes a current limiting resistor R2, one end of the current limiting resistor R2 is used for receiving a control signal, and one end of the current limiting resistor R2 is connected to the controlled end of the power switch Q1.
In this embodiment, the power switch Q1 may be implemented by a MOS transistor, an IGBT, an HEMT, etc., where the MOS transistor is taken as an example for description, and turns on/off at a corresponding frequency according to a received control signal to drive the corresponding dc load 100 to operate, and specifically, the control signal is divided by the current limiting resistor R2 and the pull-down resistor R1 and then output to the MOS transistor to drive the MOS transistor to turn on/off, so as to provide corresponding power to the dc load 100. In this embodiment, the pull-down resistor R1 is connected in series between the gate and the source of the MOS transistor, and is used to provide a gate-source bias voltage, so as to improve the switching characteristics of the MOS transistor. Diodes are connected in series in a control ground loop of each channel, the position of each diode needs to be beyond a gate pull-down resistor R1 and a source of the MOS transistor, namely, an anode of each diode is arranged at a common end of a pull-down resistor R1 and a source, so that the interference of the diodes on the control ground loop formed by the gate, the source and the pull-down resistor R1 of the MOS transistor is reduced, and the anti-interference capability of the gate and the correctness of control voltage (Vgs) generated after a control driving signal (PWM) passes through the gate pull-down resistor R1 are ensured.
The invention also provides a heating assembly, which comprises an electric control board, a plurality of direct current loads 100 arranged in parallel and the direct current load driving circuit;
the direct current load driving circuit is arranged on the electric control board.
In this embodiment, the dc load 100 may be disposed on the electronic control board, or may be connected to the dc load driving circuit on the electronic control board through an electrical connector and a cable. The electric control board may further be provided with a circuit function module capable of receiving a control instruction of a user, for example, the main controller 40, the power loop of the dc load 100 may be controlled by the main controller 40 to control the on/off of the power loop of the dc load 100, at this time, each dc load driving branch 20 is electrically connected to the main controller 40, the main controller 40 may receive a control instruction triggered by the user, for example, a voice control instruction, a key control instruction, or a wireless control instruction triggered based on a mobile terminal, and the like, set a heating temperature, and output a control signal to each dc load driving branch 20, so as to heat the target object to a temperature set by the user.
In an embodiment, the electronic control board is further provided with a connector, the heating assembly further includes a dc power supply 30, and the dc power supply 30 is electrically connected to the dc load driving circuit and the dc load 100 through a conductive member and the connector.
In this embodiment, the conductive member is a cable, the electric control board and the dc power supply 30 are electrically connected in a pluggable manner via a connector, a power loop can be formed among each dc load 100, the electric control board and the dc power supply 30, when the cable or connector at the negative terminal of the power circuit is disconnected, or in poor contact, the current on the path with the negative terminal open or in poor contact flows back from the controlled ground loop to the controlled ground SGND, since the dc load driving branches 20 of each channel are connected in series with the isolation circuit 10, the current flowing out from the open power loop cannot flow back to the negative terminal of the dc load 100 through the ground terminals of the SGND and other dc load driving branches 20, the power loop with the open circuit can not generate current, and the risk of abnormal operation or burning of the circuit caused by the reflux of the current through the control ground loop is reduced.
The invention also provides electrical equipment which comprises the direct current load driving circuit; and/or include a heating assembly as above.
In this embodiment, the electrical equipment may be heating electrical equipment such as an electric water heater, an electromagnetic oven, an electric oven, and a thermostat, the dc load 100 in the heating assembly may be a heating device, and the heating device may be correspondingly disposed in the electrical equipment according to the electrical equipment in practical application. The detailed structures of the dc load driving circuit and the heating element can refer to the above embodiments, and are not described herein again; it can be understood that, because the dc load driving circuit and the heating element are used in the electrical apparatus of the present invention, the embodiment of the electrical apparatus of the present invention includes all technical solutions of all embodiments of the dc load driving circuit and the heating element, and the achieved technical effects are also completely the same, and are not described herein again.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A direct current load driving circuit is applied to electrical equipment, and the electrical equipment comprises a plurality of direct current loads which are arranged in parallel; characterized in that the DC load driving circuit comprises:
a plurality of isolation circuits;
the direct current load driving circuit comprises a plurality of direct current load driving branches, a control signal is respectively connected to the controlled end of each direct current load driving branch, the grounding end of each direct current load driving branch is connected with a control ground through an isolation circuit and is connected with the negative pole end of a direct current power supply, and the output end of each direct current load driving branch is used for being connected with a direct current load.
2. The dc load driving circuit according to claim 1, wherein each of the isolation circuits comprises a unidirectional conducting device, an input terminal of the unidirectional conducting device is connected to the ground terminal of the corresponding dc load driving branch, and an output terminal of the unidirectional conducting device is connected to a control ground.
3. The dc load driving circuit of claim 2, wherein the unidirectional conducting device is a diode.
4. The dc load driving circuit according to claim 1, further comprising:
the output ends of the main controller are connected with the controlled ends of the direct current load driving branches in a one-to-one correspondence manner;
the main controller is used for outputting a control signal to each direct current load driving branch circuit so as to control each direct current load driving branch circuit to drive the corresponding direct current load to work.
5. The dc load driving circuit according to claim 4, further comprising a plurality of current detection circuits, each of the current detection circuits being serially connected between one of the dc load driving branches and the dc load, an output terminal of each of the current detection circuits being connected to the main controller, the current detection circuits being configured to detect a current flowing through the corresponding dc load driving branch and output a current detection signal;
and the main controller is also used for controlling the corresponding direct current load driving branch circuit to work/stop working according to the current detection signal.
6. The dc load driving circuit according to any one of claims 1 to 5, wherein each of the dc load driving branches comprises a power switch transistor and a pull-down resistor, the controlled terminal of the power switch transistor is the controlled terminal of the dc load driving branch, the output terminal of the power switch transistor is the output terminal of the dc load driving branch, the ground terminal of the power switch transistor is the ground terminal of the dc load driving branch, and the pull-down resistor is serially connected between the controlled terminal and the ground terminal of the power switch transistor.
7. The dc load driving circuit according to claim 6, wherein each of the dc load driving branches further comprises a current limiting resistor, one end of the current limiting resistor is used for receiving a control signal, and one end of the current limiting resistor is connected to the controlled end of the power switching tube.
8. A heating assembly comprising an electronic control board, a plurality of dc loads arranged in parallel, and a dc load driving circuit according to any one of claims 1 to 7;
the direct current load driving circuit is arranged on the electric control board.
9. The heating assembly of claim 8, wherein the electrical control board further comprises a connector, and the heating assembly further comprises a dc power source electrically connected to the dc load driving circuit and the dc load through a conductive member and the connector.
10. An electrical apparatus, characterized in that the electrical apparatus comprises a direct current load driving circuit according to any one of claims 1 to 7;
and/or comprising a heating assembly according to any of claims 8 and 9.
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| CN114326867B (en) | 2023-04-11 |
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