CN213846642U - Load driving circuit and electronic device - Google Patents
Load driving circuit and electronic device Download PDFInfo
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- CN213846642U CN213846642U CN202022939162.5U CN202022939162U CN213846642U CN 213846642 U CN213846642 U CN 213846642U CN 202022939162 U CN202022939162 U CN 202022939162U CN 213846642 U CN213846642 U CN 213846642U
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Abstract
The utility model discloses a load drive circuit and electronic equipment. The load driving circuit comprises a signal isolation circuit, a switch control circuit and a switch control protection circuit; the signal isolation circuit is used for outputting an isolated switch control signal to the switch control circuit according to the received switch control signal so as to enable the switch control circuit to be switched on or switched off, thereby controlling the normal work of the electric load; switch control protection circuit can trigger output overcurrent protection signal in order to control when detecting power consumption load emergence short circuit or overflowing switch control circuit turn-offs in order to realize the guard action, the utility model provides a load drive circuit need not change the device alright with protection after realizing the power consumption load short circuit and practiced thrift manufacturing cost to, can automatic recovery normal work after the trouble is eliminated, improved the ease for use.
Description
Technical Field
The utility model relates to the field of electronic technology, in particular to load drive circuit and electronic equipment.
Background
With the development of the technology, in the field of industrial control, people have higher and higher requirements on the reliability of products, and for some loads needing to be controlled, such as electromagnetic valves or fans, reliable operation is required, and protection is also required when the loads are short-circuited, so that the products are not damaged.
At present, many load output protection circuits adopt the mode of shunt and comparator protection, that is to say, when the shunt reaches the overcurrent point, the comparator overturns, the control chip blocks the drive circuit after receiving the upset signal, or, still, the short-circuit current is restricted through fuse or other protection devices to realize overcurrent or short-circuit protection, however, the mode of adopting shunt and comparator protection needs to have an extra control chip to detect the state of overflowing, thereby can block the output when overflowing, thus the cost is high, and the realization is more complicated, and it is simple to adopt protection device protection to realize, but often self damaged after the protection device action like fuse, can reuse after needing to be changed, the ease of use is not good.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a load drive circuit aims at solving the problem that load drive circuit ease of use is poor and need the replacement.
To achieve the above object, the present invention provides a load driving circuit, which includes:
the input end of the signal isolation circuit is used for accessing a switch control signal; the signal isolation circuit is used for isolating the accessed switch control signal and then outputting the isolated switch control signal;
the controlled end of the switch control circuit is connected with the signal isolation circuit, the output end of the switch control circuit is connected with an electric load, and the switch control circuit is used for receiving an isolated switch control signal and is switched on or switched off according to the isolated switch control signal so as to drive the electric load to work;
the detection end of the switch control protection circuit is connected with the output end of the switch control circuit, and the output end of the switch control protection circuit is connected with the controlled end of the switch control circuit; and the switch control protection circuit is used for controlling the switch control circuit to stop working when detecting that the power load is subjected to overcurrent.
In one embodiment, the switch control protection circuit comprises a first protection circuit and a second protection circuit;
the first protection circuit is connected with the power load and used for outputting a corresponding first protection signal when the power load is detected to be over-current;
the second protection circuit is connected with the first protection circuit and used for outputting a corresponding second protection signal to the switch control circuit after receiving the first protection signal so as to control the switch control circuit to be closed.
In one embodiment, the first protection circuit includes a first diode, an anode of the first diode is used as an input terminal of the first protection circuit, and a cathode of the first diode is used as an output terminal of the first protection circuit.
In one embodiment, the second protection circuit comprises a second diode, a first switching tube, a first resistor and a capacitor;
the anode of the second diode is connected with the first end of the first resistor, the second end of the first resistor is connected with the signal isolation circuit, the cathode of the second diode, the controlled end of the first switch tube and the first end of the capacitor are interconnected, the second end of the capacitor is connected with the signal isolation circuit, the input end of the first switch tube is grounded, and the output end of the first switch tube is connected with the controlled end of the switch control circuit.
In one embodiment, the second protection circuit comprises a voltage regulator tube, a first switch tube, a first resistor and a capacitor;
the cathode of the voltage-regulator tube is connected with the first end of the first resistor, the second end of the first resistor is connected with the signal isolation circuit, the anode of the voltage-regulator tube, the controlled end of the first switch tube and the first end of the capacitor are interconnected, the second end of the capacitor is connected with the signal isolation circuit, the input end of the first switch tube is grounded, and the output end of the first switch tube is connected with the controlled end of the switch control circuit.
In one embodiment, the signal isolation circuit comprises an optical coupler, a first power supply end, a second resistor and a third resistor;
the first end of the second resistor serves as the input end of the signal isolation circuit, the second end of the second resistor is connected with the first input end of the optocoupler, the second input end of the optocoupler is grounded, the first output end of the optocoupler is connected with the switch control circuit, the second output end of the optocoupler is connected with the first end of the third resistor, and the second end of the third resistor is connected with the first power supply end.
In one embodiment, the switch control circuit comprises a second switch tube;
the controlled end of the second switch tube is connected with the signal isolation circuit, the input end of the second switch tube is grounded, and the output end of the second switch tube is connected with the power load.
In one embodiment, the consumer load comprises a power supply;
the output end of the power supply is connected with one end of the power utilization load;
and the output end of the switch control circuit is connected with the other end of the power utilization load.
In one embodiment, the consumer load comprises a power supply;
and the output end of the power supply is connected with the input end of the switch control circuit.
The utility model also provides an electronic device, which comprises the power utilization load and the load driving circuit;
and the output end of the load driving circuit is connected with the electric load.
The utility model provides an among the load drive circuit, wherein, signal isolation circuit is used for according to the on-off control signal of receipt, and the on-off control signal after the output is kept apart to on-off control circuit to make on-off control circuit open or close, thereby control the normal work of power consumption load, on the other hand, on-off control protection circuit can trigger output when detecting power consumption load and take place the short circuit or overflow and overflow protection signal in order to control the on-off control circuit turn-offs in order to realize the guard action, the utility model provides a load drive circuit need not change the device alright with the protection after realizing the power consumption load short circuit and practiced thrift manufacturing cost to, can automatic recovery normal work after the trouble is eliminated, improved the ease for use.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 schematic diagram of functional modules of an embodiment of a load driving circuit according to the present invention;
fig. 2 is a circuit diagram of an embodiment of the load driving circuit of the present invention;
fig. 3 is a circuit diagram of another embodiment of the load driving circuit of the present invention;
fig. 4 is a waveform simulation diagram of an embodiment of the present invention for normal on/off of the load driving circuit;
fig. 5 is a waveform simulation diagram of an embodiment of the present invention in which a short-circuit fault occurs in the load driving circuit.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
30 | Switch |
| 20 | |
40 | Load using electricity |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to 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, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a load drive circuit and electronic equipment.
The utility model provides a load drive circuit, referring to fig. 1 to 5, this load drive circuit includes:
the input end of the signal isolation circuit 10 is used for accessing a switch control signal; the signal isolation circuit 10 is configured to isolate the switch control signal that is accessed and then output the switch control signal;
the controlled end of the switch control circuit 20 is connected to the signal isolation circuit 10, the output end of the switch control circuit 20 is connected to the electrical load 40, and the switch control circuit 20 is configured to receive the isolated switch control signal and turn on or off according to the isolated switch control signal to drive the electrical load 40 to work;
a detection end of the switch control protection circuit 30 is connected with an output end of the switch control circuit 20, and an output end of the switch control protection circuit 30 is connected with a controlled end of the switch control circuit 20; the switch control protection circuit 30 is configured to control the switch control circuit 20 to stop working when detecting that the electrical load 40 is over-current or short-circuited. The switch control protection circuit 30 may implement the switch triggering detection through a transistor or other switching elements, which is not limited herein. It should be noted that, in this embodiment, the electric load 40 may be some loads that need to be controlled, such as a solenoid valve or a fan, and in other embodiments, may be other loads;
the signal isolation circuit 10 is used for accessing a switch control signal output by the main controller, the switch control signal includes an on control signal and an off control signal, when the signal isolation circuit 10 outputs the on control signal, the switch control circuit 20 is on, at this time, the electric load 40 normally works, when the signal isolation circuit 10 outputs the off control signal, the switch control circuit 20 is off, at this time, the electric load 40 does not work or is in a standby state; it should be noted that the main controller may be implemented by a microprocessor such as a single chip microcomputer, a DSP, an FPGA, or an MCU, which plays a central control role, and in some other embodiments, may also be implemented by a programmable logic controller PLC or a CPLD, which is not limited herein.
In addition, in order to prevent the load driving circuit from being damaged, the switch control protection circuit 30 detects that the electric load 40 is short-circuited or over-current to trigger the output of an over-current protection signal to control the switch control circuit 20 to be turned off for protection; in addition, after the short-circuit fault is relieved, any device does not need to be replaced, the load driving circuit can still recover to normally work, and the usability is improved.
It can be understood that the utility model provides a load drive circuit is at normal during operation, and signal isolation circuit 10 is used for according to the on-off control signal of receipt, and the on-off control signal after the output is kept apart to on-off control circuit 20 to make on-off control circuit 20 open or close, thereby control the normal work of power consumption load 40, on the other hand, on-off control protection circuit 30 can trigger output overcurrent protection signal in order to control when detecting power consumption load 40 takes place the short circuit or overflows the turn-off of on-off control circuit 20 is in order to realize the protection, the utility model provides a load drive circuit need not change the device alright in order to realize the protection after power consumption load 40 short circuit and practiced thrift manufacturing cost to, can automatic recovery normal work after the troubleshooting, improved the ease of use.
In one embodiment, referring to fig. 2 or 3, the switch control protection circuit 30 includes a first protection circuit and a second protection circuit;
the first protection circuit is connected with the electric load 40, and is used for outputting a corresponding first protection signal when detecting that the electric load 40 is in overcurrent;
the second protection circuit is connected to the first protection circuit, and the second protection circuit is configured to output a corresponding second protection signal to the switch control circuit 20 after receiving the first protection signal, so as to control the switch control circuit 20 to be turned off.
In this embodiment, when the electrical load 40 is short-circuited or has an overcurrent fault, the first protection circuit is triggered to output a corresponding first protection signal to the second protection circuit, and the second protection circuit triggers to output a second protection signal to the switch control circuit 20 according to the received first protection signal, so as to control the switch control circuit 20 to be turned off to perform a protection function, and after the short-circuited or overcurrent fault disappears, the load driving circuit can still control the electrical load 40 to normally operate without replacing devices; for example, when the electrical load 40 is in a short circuit or an overcurrent fault, that is, it is detected that the potential of the measurement terminal of the switch control protection circuit 30 is pulled up rapidly, the first protection circuit outputs a corresponding first protection signal, and when the voltage of the first protection signal is greater than the maximum voltage drop that the second protection circuit can bear, the second protection circuit outputs a second protection control signal to control the potential of the output terminal of the switch control circuit 20 to be pulled down, so that the switch control circuit 20 is turned off to stop working with the electrical load 40.
Specifically, in an embodiment, referring to fig. 2, the first protection circuit includes a first diode D1, an anode of the first diode D1 is used as an input terminal of the first protection circuit, and a cathode of the first diode D1 is used as an output terminal of the first protection circuit, and in other embodiments, the first protection circuit may be implemented by using other protection devices.
In an embodiment, referring to fig. 2, the second protection circuit includes a second diode D2, a first switch Q1, a first resistor R1, and a capacitor C1;
an anode of the second diode D2 is connected to a first end of the first resistor R1, a second end of the first resistor R1 is connected to the signal isolation circuit 10, a cathode of the second diode D2, a controlled end of the first switch tube Q1 and a first end of the capacitor C1 are interconnected, a second end of the capacitor C1 is connected to the signal isolation circuit 10, an input end of the first switch tube Q1 is grounded, and an output end of the first switch tube Q1 is connected to the controlled end of the switch control circuit 20; the first switch Q1 may be implemented by any one of switching transistors such as a triode, a MOS transistor, and an IGBT, which is not limited herein.
In another embodiment, referring to fig. 3, the second protection circuit includes a voltage regulator D3, a first switch Q1, a first resistor R1, and a capacitor C1;
the cathode of the voltage regulator tube D3 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the signal isolation circuit 10, the anode of the voltage regulator tube D3, the controlled end of the first switch tube Q1 and the first end of the capacitor C1 are interconnected, the second end of the capacitor C1 is connected to the signal isolation circuit 10, the input end of the first switch tube Q1 is grounded, and the output end of the first switch tube Q1 is connected to the controlled end of the switch control circuit 20. The second protection circuit has the same functions as those of the above embodiments, and is not described herein again.
Specifically, in an embodiment, referring to fig. 2, fig. 2 is a circuit diagram of an embodiment of the load driving circuit of the present invention;
when a short circuit occurs in a normal on state, because the current is large, the voltage of the output terminal VQ of the switch control circuit 20 is rapidly increased, and when the voltage exceeds the conduction voltage drop of the second diode D2 and the base voltage drop of the first switch tube Q1, the first diode D1 is turned off, and the power VCC supplies the base current to the first switch tube Q1 through the first resistor R1, so that the first switch tube Q1 is turned on, the voltage of the controlled terminal of the switch control circuit 20 is pulled low, and thus, the switch control circuit 20 is turned off, and the short circuit fault is removed. Since the switch control circuit 20 is turned off, the voltage at the output terminal VQ of the switch control circuit 20 is equal to the voltage of the power supply VDD, and at this time, the first diode D1 maintains the off state, the first switch tube Q1 can be continuously turned on, and at this time, although the input terminal VIN of the signal isolation circuit 10 is at the high level, the switch control circuit 20 can still be turned off. And, after the fault is eliminated, the switch control circuit 20 can continue to operate according to the previous normal turn-on or turn-off process.
In a normal state, in a standby state, the switch control circuit 20 is turned off, at this time, the voltage of the output terminal VQ of the switch control circuit 20 is equal to the voltage of the power supply VDD, at this time, the first diode D1 is turned off, the first switching tube Q1 is turned on by the base current provided by the power supply VCC through the resistor R1, at this time, the voltage at VM is the sum of the voltage drops of the second diode D2 and the first switching tube Q1, and at the same time, the voltage at VC is also equal to the voltage of the power supply VCC;
when the switch is normally turned on, the voltage input by the input end VIN of the signal isolation circuit 10 is changed from low to high, the optical coupler is turned on, the voltage at the VC position is quickly pulled down, and the voltage of the capacitor C1 cannot be suddenly changed, so that the base-level voltage of the first switch tube Q1 becomes negative, the first switch tube Q1 is turned off, at this time, the switch control circuit 20 is normally turned on, and the voltage of the output end VQ of the switch control circuit 20 is pulled down to the voltage drop when the switch tube Q2 is turned on; in addition, since the voltage at VM is greater than the voltage at the output terminal VQ of the switch control circuit 20, the first diode D1 is turned on, and the voltage at VM is clamped to the voltage at the output terminal VQ of the switch control circuit 20, so that the base stage of the first switch tube Q1 is not energized, and therefore, the first switch tube Q1 is turned off;
in the normal turn-off process, the voltage input by the input end VIN of the signal isolation circuit 10 is changed from high to low, the optical coupler is turned off, the switch control circuit 20 is not excited and then turned off, the voltage of the output end VQ of the switch control circuit 20 is pulled up to the power supply VDD, at the moment, the first diode D1 is cut off, the first switch tube Q1 can obtain excitation current through the resistor R1, so that the first switch tube Q1 is turned on, and the capacitor C1 is charged to VCC.
Further, for convenience of understanding, reference may be made to fig. 4 and fig. 5, where fig. 4 is a waveform simulation diagram of an embodiment of the present invention in which the load driving circuit normally turns on and off, and fig. 5 is a waveform simulation diagram of an embodiment of the present invention in which the load driving circuit generates a short-circuit fault. Wherein, VIN is the on-off control signal voltage waveform change curve of signal isolation circuit 10 input, and VQ is on-off control circuit 20 output voltage signal change curve, and when 0.02s took place short-circuit fault, the voltage of on-off control circuit 20 output was pulled high rapidly by low, in the back is relieved in the trouble, load drive circuit still can resume normal work, consequently, the utility model provides a load drive circuit need not change the device alright with the protection after realizing the power consumption load short circuit and practiced thrift manufacturing cost to, can normal work of self-recovery after the trouble is eliminated, improved the ease for use.
In an embodiment, referring to fig. 1 to 5, in order to prevent signal interference, the signal isolation circuit 10 includes an optical coupler U1, a first power supply terminal VCC, a second resistor R2, and a third resistor R3;
a first end of the second resistor R2 is used as an input end of the signal isolation circuit 10, a second end of the second resistor R2 is connected with a first input end of the optocoupler U1, a second input end of the optocoupler U1 is grounded, a first output end of the optocoupler U1 is connected with the switch control circuit 20, a second output end of the optocoupler U1 is connected with a first end of the third resistor R3, and a second end of the third resistor R3 is connected with the first power supply terminal VCC; it should be noted that the voltage of the first power supply terminal VCC is set according to the user's requirement, and is not limited herein.
Wherein, first power end VCC inserts the power, when the on-off control signal input turn-on signal, opto-coupler U1 switches on, signal isolation circuit 10 output turn-on control signal, when the on-off control signal input turn-off signal, opto-coupler U1 closes, signal isolation circuit 10 output turn-off control signal, and so, make signal isolation circuit 10 input and output realized electrical isolation completely, output signal does not have the influence to the input, the interference killing feature is strong, job stabilization, in other embodiments, signal isolation circuit 10 can also adopt other isolation devices in order to realize, do not limit here.
In one embodiment, referring to fig. 1 to 5, the switch control circuit 20 includes a second switch transistor Q2;
the controlled end of the second switch Q2 is connected to the signal isolation circuit 10, the input end of the second switch Q2 is grounded, and the output end of the second switch Q2 is connected to the electrical load 40. In this embodiment, the second switch Q2 is implemented by using an NPN transistor, when the signal isolation circuit 10 outputs the on signal, the second switch Q2 is turned on, and the electric load 40 normally operates, and when the signal isolation circuit 10 outputs the off signal, the second switch Q2 is turned off, and the electric load 40 normally does not operate.
In one embodiment, referring to fig. 1 to 5, the electric load 40 includes a power supply VDD;
the output end of the power supply is connected with one end of the power load 40;
the output terminal of the switch control circuit 20 is connected to the other terminal of the electrical load 40. The electric load 40 is implemented by using a load resistor RL, wherein the electric load 40 may be some loads needing to be controlled, such as an electromagnetic valve or a fan, or others, it should be noted that the power supply is used to supply power to the electric load 40, the power supply may be implemented by using a lithium battery or others, and the voltage of the power supply is set according to a user requirement, which is not specifically limited herein.
In another embodiment, the electrical load 40 comprises a power supply;
the output terminal of the power supply is connected to the input terminal of the switch control circuit 20. The switch control circuit 20 may be implemented by a PNP transistor, it should be noted that the power supply is used to supply power to the electrical load 40, the power supply may be implemented by a lithium battery or others, and the voltage of the power supply is set according to the user requirement, which is not specifically limited herein.
The utility model also provides an electronic device, which comprises the load driving circuit of the embodiment; the output of the load driving circuit is connected to the electrical load 40. The specific structure of the electronic device refers to the above embodiments, and since the electronic device adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.
The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (10)
1. A load driving circuit, comprising:
the input end of the signal isolation circuit is used for accessing a switch control signal; the signal isolation circuit is used for isolating the accessed switch control signal and then outputting the isolated switch control signal;
the controlled end of the switch control circuit is connected with the signal isolation circuit, the output end of the switch control circuit is connected with an electric load, and the switch control circuit is used for receiving an isolated switch control signal and is switched on or switched off according to the isolated switch control signal so as to drive the electric load to work;
the detection end of the switch control protection circuit is connected with the output end of the switch control circuit, and the output end of the switch control protection circuit is connected with the controlled end of the switch control circuit; and the switch control protection circuit is used for controlling the switch control circuit to stop working when detecting that the power load is subjected to overcurrent.
2. The load driving circuit of claim 1, wherein the switch control protection circuit comprises a first protection circuit and a second protection circuit;
the first protection circuit is connected with the power load and used for outputting a corresponding first protection signal when the power load is detected to be over-current;
the second protection circuit is connected with the first protection circuit and used for outputting a corresponding second protection signal to the switch control circuit after receiving the first protection signal so as to control the switch control circuit to be closed.
3. The load driving circuit of claim 2, wherein the first protection circuit comprises a first diode, an anode of the first diode being an input of the first protection circuit, and a cathode of the first diode being an output of the first protection circuit.
4. The load driving circuit of claim 2, wherein the second protection circuit comprises a second diode, a first switching tube, a first resistor, and a capacitor;
the anode of the second diode is connected with the first end of the first resistor, the second end of the first resistor is connected with the signal isolation circuit, the cathode of the second diode, the controlled end of the first switch tube and the first end of the capacitor are interconnected, the second end of the capacitor is connected with the signal isolation circuit, the input end of the first switch tube is grounded, and the output end of the first switch tube is connected with the controlled end of the switch control circuit.
5. The load driving circuit according to claim 2, wherein the second protection circuit comprises a voltage regulator tube, a first switch tube, a first resistor and a capacitor;
the cathode of the voltage-regulator tube is connected with the first end of the first resistor, the second end of the first resistor is connected with the signal isolation circuit, the anode of the voltage-regulator tube, the controlled end of the first switch tube and the first end of the capacitor are interconnected, the second end of the capacitor is connected with the signal isolation circuit, the input end of the first switch tube is grounded, and the output end of the first switch tube is connected with the controlled end of the switch control circuit.
6. The load driving circuit of claim 1, wherein the signal isolation circuit comprises an optocoupler, a first power supply terminal, a second resistor, and a third resistor;
the first end of the second resistor serves as the input end of the signal isolation circuit, the second end of the second resistor is connected with the first input end of the optocoupler, the second input end of the optocoupler is grounded, the first output end of the optocoupler is connected with the switch control circuit, the second output end of the optocoupler is connected with the first end of the third resistor, and the second end of the third resistor is connected with the first power supply end.
7. The load driving circuit of claim 1, wherein the switch control circuit comprises a second switching tube;
the controlled end of the second switch tube is connected with the signal isolation circuit, the input end of the second switch tube is grounded, and the output end of the second switch tube is connected with the power load.
8. The load driving circuit according to any one of claims 1 to 7, wherein the electrical load comprises a power supply;
the output end of the power supply is connected with one end of the power utilization load;
and the output end of the switch control circuit is connected with the other end of the power utilization load.
9. The load driving circuit according to any one of claims 1 to 7, wherein the electrical load comprises a power supply;
and the output end of the power supply is connected with the input end of the switch control circuit.
10. An electronic device, comprising: an electric load and a load driving circuit according to any one of claims 1 to 9;
and the output end of the load driving circuit is connected with the electric load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022939162.5U CN213846642U (en) | 2020-12-09 | 2020-12-09 | Load driving circuit and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022939162.5U CN213846642U (en) | 2020-12-09 | 2020-12-09 | Load driving circuit and electronic device |
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| Publication Number | Publication Date |
|---|---|
| CN213846642U true CN213846642U (en) | 2021-07-30 |
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| CN202022939162.5U Active CN213846642U (en) | 2020-12-09 | 2020-12-09 | Load driving circuit and electronic device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114326867A (en) * | 2021-12-30 | 2022-04-12 | 广东美的白色家电技术创新中心有限公司 | Direct current load drive circuit, heating assembly and electrical equipment |
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2020
- 2020-12-09 CN CN202022939162.5U patent/CN213846642U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114326867A (en) * | 2021-12-30 | 2022-04-12 | 广东美的白色家电技术创新中心有限公司 | Direct current load drive circuit, heating assembly and electrical equipment |
| CN114326867B (en) * | 2021-12-30 | 2023-04-11 | 广东美的白色家电技术创新中心有限公司 | Direct current load drive circuit, heating assembly and electrical equipment |
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