CN112684385B - Reverse connection preventing circuit and application device thereof - Google Patents
Reverse connection preventing circuit and application device thereof Download PDFInfo
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- CN112684385B CN112684385B CN202011471382.8A CN202011471382A CN112684385B CN 112684385 B CN112684385 B CN 112684385B CN 202011471382 A CN202011471382 A CN 202011471382A CN 112684385 B CN112684385 B CN 112684385B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention provides an anti-reverse connection circuit and an application device thereof, which are applied to the technical field of hydrogen production by water electrolysis, wherein the anti-reverse connection circuit is connected between the positive output end of a hydrogen production power supply and the ground in series, and when the positive output end of the hydrogen production power supply is connected with the positive input end of a hydrogen production cell by water electrolysis, the anti-reverse connection circuit outputs a first voltage; when the positive output end of the hydrogen production power supply is connected with the negative input end of the water electrolysis hydrogen production tank, the reverse connection preventing circuit outputs a second voltage. The reverse connection preventing circuit can output different voltages according to different specific connection conditions, wherein one voltage corresponds to the correct connection relationship between the hydrogen production power supply and the water electrolysis hydrogen production tank, the other voltage corresponds to the wrong connection relationship between the hydrogen production power supply and the water electrolysis hydrogen production tank, and whether the hydrogen production power supply and the water electrolysis hydrogen production tank are reversely connected or not can be intuitively judged according to the specific voltage output by the reverse connection preventing circuit, so that the normal operation of the water electrolysis hydrogen production system is ensured.
Description
Technical Field
The invention relates to the technical field of hydrogen production by water electrolysis, in particular to an anti-reverse connection circuit and an application device thereof.
Background
In practical application, based on the basic principle of the hydrogen production system by water electrolysis, if the condition that the positive electrode and the negative electrode of the hydrogen production power supply by water electrolysis are reversely connected occurs in the system, O2 is generated by the negative electrode which originally generates H2, H2 is generated by the positive electrode which originally generates O2, and further, the phenomenon of hydrogen and oxygen mixing occurs, which leads to serious consequences.
The current output by the water electrolysis hydrogen production power supply is large under the common condition, and meanwhile, in view of cost and system power loss, common passive reverse connection prevention devices in the prior art, such as power devices like diodes, are no longer suitable for reverse connection prevention protection of the water electrolysis hydrogen production power supply.
Therefore, how to prevent the reverse connection of the power supply for producing hydrogen by water electrolysis and ensure the normal operation of the system for producing hydrogen by water electrolysis becomes one of the technical problems to be solved by the technical personnel in the field.
Disclosure of Invention
The invention provides an anti-reverse connection circuit and an application device thereof, which output different voltages according to different connection conditions of the output end of a hydrogen production power supply, so as to judge whether a water electrolysis hydrogen production power supply is reversely connected or not, and further ensure the normal operation of a water electrolysis hydrogen production system.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
in a first aspect, the invention provides a reverse connection prevention circuit, which is connected in series between the positive output end of a hydrogen production power supply and the ground;
when the positive output end of the hydrogen production power supply is connected with the positive input end of the water electrolysis hydrogen production tank, the reverse connection preventing circuit outputs a first voltage;
and when the positive output end of the hydrogen production power supply is connected with the negative input end of the water electrolysis hydrogen production tank, the reverse connection preventing circuit outputs a second voltage.
Optionally, the reverse connection prevention circuit includes: a power supply and a voltage divider circuit are detected, wherein,
the detection power supply is connected with the voltage division circuit;
the voltage division circuit is connected between the anode output end of the hydrogen production power supply and the ground in series;
when the anode output end of the hydrogen production power supply is connected with the anode input end of the water electrolysis hydrogen production tank, the voltage division circuit outputs the output voltage of the detection power supply according to a first voltage division proportion so as to feed back the first voltage;
when the anode output end of the hydrogen production power supply is connected with the cathode input end of the water electrolysis hydrogen production tank, the voltage division circuit outputs the output voltage of the detection power supply according to a second voltage division proportion so as to feed back the second voltage.
Optionally, the reverse connection preventing circuit provided in the first aspect of the present invention further includes: a protection circuit, wherein,
the protection circuit is connected in series between the positive electrode output end of the hydrogen production power supply and the voltage division circuit;
the protection circuit is in a disconnected state when the hydrogen production power supply works.
Optionally, the protection circuit includes: controllable switches or unidirectional conducting devices.
Optionally, the controllable switch includes any one of a relay, a contactor, and a semiconductor switch tube.
Optionally, the voltage divider circuit includes: a first resistor, a second resistor, and a third resistor, wherein,
one end of the first resistor is connected with the anode output end of the hydrogen production power supply, and the other end of the first resistor is grounded through the second resistor;
one end of the third resistor is connected with the anode of the detection power supply, and the other end of the third resistor is connected with the connection point of the first resistor and the second resistor;
the negative electrode of the detection power supply is grounded;
and two ends of the second resistor are used as output ends of the voltage division circuit to output the first voltage or the second voltage.
Optionally, the resistance value of the second resistor approaches infinity;
the resistance value of the first resistor approaches zero.
Optionally, the unidirectional conducting device comprises a diode.
In a second aspect, the present invention provides a hydrogen-producing power supply comprising: a control unit, a power conversion unit, and an anti-reverse connection circuit according to any one of the first aspect of the present invention, wherein,
the control unit is respectively connected with the power conversion unit and the reverse connection preventing circuit;
the input end of the power conversion unit is used as the input end of the hydrogen production power supply;
the output end of the power conversion unit is used as the output end of the hydrogen production power supply;
the control unit is used for judging whether the water electrolysis hydrogen production tank connected with the output end of the hydrogen production power supply is reversely connected or not according to the output voltage of the reverse connection preventing circuit and controlling the working process of the power conversion unit.
Optionally, the control unit includes: a main controller, a voltage sampling circuit and a driving unit, wherein,
the main controller is connected with the control end of the power conversion unit through the driving unit;
the voltage sampling circuit is respectively connected with the main controller and the reverse connection preventing circuit.
Optionally, the power conversion unit includes an AC/DC converter or a DC/DC converter.
Optionally, the power conversion unit includes an isolated power conversion unit or a non-isolated power conversion unit.
Optionally, the power conversion unit includes a multi-stage power conversion unit or a single-stage power conversion unit.
In a third aspect, the present invention provides a system for producing hydrogen by water electrolysis, comprising: an input power supply, a water electrolysis hydrogen production cell, and the hydrogen production power supply of any one of the second aspect of the invention, wherein,
the input power supply is connected with the input end of the hydrogen production power supply;
the output end of the hydrogen production power supply is connected with the input end of the water electrolysis hydrogen production tank;
the negative electrode input end of the water electrolysis hydrogen production tank is grounded.
Optionally, the input power source comprises one of a public power grid, a photovoltaic power station and a wind power generation system.
Optionally, the water electrolysis hydrogen production tank comprises an alkaline water hydrogen production tank or a proton exchange membrane PEM electrolytic tank.
The reverse connection preventing circuit is connected between the positive output end of the hydrogen production power supply and the ground in series, and when the positive output end of the hydrogen production power supply is connected with the positive input end of the water electrolysis hydrogen production tank, the reverse connection preventing circuit outputs a first voltage; when the positive output end of the hydrogen production power supply is connected with the negative input end of the water electrolysis hydrogen production tank, the reverse connection preventing circuit outputs a second voltage. The reverse connection preventing circuit provided by the invention is connected with the anode output end of the hydrogen production power supply, different voltages can be output according to different specific connection conditions, one voltage corresponds to the correct connection relation between the hydrogen production power supply and the water electrolysis hydrogen production tank, the other voltage corresponds to the wrong connection relation between the hydrogen production power supply and the water electrolysis hydrogen production tank, and correspondingly, whether the hydrogen production power supply and the water electrolysis hydrogen production tank are reversely connected can be intuitively judged according to the specific voltage output by the reverse connection preventing circuit, so that the normal operation of the water electrolysis hydrogen production system is ensured.
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 drawings without creative efforts.
Fig. 1 is a block diagram of an anti-reverse connection circuit according to an embodiment of the present invention;
FIG. 2 is a circuit topology diagram of an anti-reverse connection circuit according to an embodiment of the present invention;
FIG. 3 is a circuit topology diagram of another anti-reverse connection circuit provided by an embodiment of the invention;
FIG. 4 is a block diagram of a hydrogen production power supply according to an embodiment of the present invention;
FIG. 5 is a block diagram of another hydrogen-producing power supply provided by an embodiment of the present invention;
FIG. 6 is a block diagram of a system for producing hydrogen by water electrolysis according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all 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 application.
Referring to fig. 1, fig. 1 is a structural block diagram of an anti-reverse connection circuit provided in the embodiment of the present invention, one end of the anti-reverse connection circuit provided in this embodiment is connected to the positive output end of the hydrogen production power supply, and the other end of the anti-reverse connection circuit is grounded, that is, the anti-reverse connection circuit is connected in series between the positive output end of the hydrogen production power supply and the ground.
In practical application, the output end of the hydrogen production power supply is connected with the input end of the water electrolysis hydrogen production tank, as shown in fig. 1, the hydrogen production power supply comprises an anode output end and a cathode output end, correspondingly, the water electrolysis hydrogen production tank comprises an anode input end and a cathode input end, the correct connection relationship between the hydrogen production power supply and the water electrolysis hydrogen production tank is shown by a dotted line in the figure, namely, the anode output end of the hydrogen production power supply is connected with the anode input end of the water electrolysis hydrogen production tank, and the cathode output end of the hydrogen production power supply is connected with the cathode input end of the water electrolysis hydrogen production tank. Based on this, the reverse connection situation that may occur in the application is: the negative input end of the water electrolysis hydrogen production tank is connected with the positive output end of the hydrogen production power supply, and the positive input end of the water electrolysis hydrogen production tank is connected with the negative input end of the hydrogen production power supply.
If the positive output end of the hydrogen production power supply is connected with the positive input end of the water electrolysis hydrogen production tank, namely the hydrogen production power supply is correctly connected with the water electrolysis hydrogen production tank, the reverse connection prevention circuit outputs a first voltage; if the positive output end of the hydrogen production power supply is connected with the negative input end of the water electrolysis hydrogen production tank, namely the hydrogen production power supply is reversely connected with the water electrolysis hydrogen production tank, the reverse connection preventing circuit outputs a second voltage.
Optionally, an optional configuration of an anti-reverse connection circuit is also shown in the embodiment shown in fig. 1, where the anti-reverse connection circuit provided in this embodiment specifically includes a detection power supply and a voltage dividing circuit, where the detection power supply is connected to the voltage dividing circuit, the voltage dividing circuit is connected in series between the positive output end of the hydrogen production power supply and ground, that is, two ends of the voltage dividing circuit are used as anti-reverse connection circuits and connected to two ends of an external circuit, and an output voltage of the detection power supply is used as a reference voltage.
Based on the connection relation, when the anode output end of the hydrogen production power supply is connected with the anode input end of the water electrolysis hydrogen production tank, the voltage division circuit outputs the output voltage of the detection power supply according to a first voltage division proportion, so that the first voltage is fed back; correspondingly, when the anode output end of the hydrogen production power supply is connected with the cathode input end of the water electrolysis hydrogen production tank, the voltage division circuit outputs the output voltage of the detection power supply according to the second voltage division proportion, so that the second voltage is fed back.
It is conceivable that the first voltage and the second voltage output by the reverse connection preventing circuit may be directly output to a control unit inside the hydrogen production power supply, and the control unit inside the hydrogen production power supply determines whether there is a reverse connection problem according to the obtained voltage.
In summary, the reverse connection preventing circuit provided by the invention is connected with the positive electrode output end of the hydrogen production power supply, different voltages can be output according to different specific connection conditions, one voltage corresponds to a correct connection relationship (the first voltage in the embodiment) between the hydrogen production power supply and the water electrolysis hydrogen production tank, the other voltage corresponds to a wrong connection relationship (the second voltage in the embodiment) between the hydrogen production power supply and the water electrolysis hydrogen production tank, and accordingly, whether the hydrogen production power supply and the water electrolysis hydrogen production tank are reversely connected can be intuitively judged according to the specific voltage output by the reverse connection preventing circuit, so that the normal operation of the water electrolysis hydrogen production system can be ensured.
The reverse connection prevention circuit provided by the embodiment of the invention can judge whether the reverse connection problem occurs or not when the water electrolysis hydrogen production system is in the standby state after the water electrolysis hydrogen production tank is connected with the hydrogen production power supply, so that the influence of the reverse connection fault on the normal operation of the system can be effectively avoided.
Optionally, in order to ensure that the reverse connection prevention circuit does not affect the normal operation of the water electrolysis hydrogen production system, the embodiment of the invention provides another reverse connection prevention circuit. Referring to fig. 2, on the basis of the embodiment shown in fig. 1, the reverse connection preventing circuit provided in this embodiment further includes: and a protection circuit. The protection circuit is connected in series between the anode output end of the hydrogen production power supply and the voltage division circuit, and the protection circuit is in a disconnected state when the hydrogen production power supply works, so that no current flows between the reverse connection prevention circuit and the hydrogen production power supply, and the normal work of the hydrogen production power supply is ensured. Certainly, when reverse connection prevention detection is carried out, the protection circuit is in a conducting state, and effective connection between the voltage division circuit at the later stage and the positive electrode output end of the hydrogen production power supply is ensured.
Optionally, referring to fig. 3, fig. 3 is a circuit topology diagram of an anti-reverse connection circuit according to an embodiment of the present invention, and this embodiment provides a specific configuration manner of the anti-reverse connection circuit on the basis of the example shown in fig. 2.
DC power supply V for detection power supply DC And (5) realizing. In practical application, the DC power supply V DC The invention comprehensively considers factors such as voltage range and detection precision requirements which can be acquired by a control unit for receiving the output voltage of the reverse connection preventing circuit, loss requirements of the reverse connection preventing circuit and the like, and is used for the direct current power supply V DC The specific type of the compound is not limited.
The voltage division circuit specifically includes: a first resistor R1, a second resistor R2 and a third resistor R3, wherein,
one end of the first resistor R1 is connected with the positive electrode output end of the hydrogen production power supply, the other end of the first resistor R1 is grounded through the second resistor R2, one end of the third resistor R3 is connected with the positive electrode of the detection power supply, and the other end of the third resistor R3 is connected with the connection point of the first resistor R1 and the second resistor R2.
Furthermore, the negative electrode of the detection power supply is grounded, and two ends of the second resistor R2 are used as the output end of the voltage division circuit to output the first voltage or the second voltage.
The protection circuit includes: controllable switches or unidirectional conducting devices. If the protection circuit is realized based on the controllable switch, the controllable switch is in a disconnected state when reverse connection detection is carried out, and correspondingly, the controllable switch is in a connected state when the hydrogen generation power supply normally works, so that the normal work of a rear-stage circuit is ensured. In practical applications, the controllable switch includes any one of a relay, a contactor, and a semiconductor switch tube. The control process of the controllable switch may be implemented by a controller that receives the first voltage or the second voltage, which is not limited in the present invention.
For the one-way conduction device, the diode D1 is specifically selected to implement in the embodiment shown in fig. 3. Based on the basic principle of the diode, when the two ends of the diode D1 bear the forward voltage drop, the diode D1 is in the on state, and when the two ends of the diode D1 bear the negative voltage drop, the diode D1 is in the off state.
The basic process of the reverse connection prevention circuit for realizing the reverse connection prevention function is described below with reference to the specific structure of the reverse connection prevention circuit in the figure.
Assuming that the output end of the hydrogen production power supply and the input end of the water electrolysis hydrogen production tank are not reversely connected, the hydrogen production system is judged to be reversely connected (namely, the output voltage of the reverse connection preventing circuit is read) after entering a standby state, and at the moment, the detection power supply V DC Output detection voltage V b The positive output end of the hydrogen production power supply is connected with the positive input end of the water electrolysis hydrogen production tank, the first resistor R1 does not have a corresponding conduction loop, and the detection power supply V DC The positive pole of the second resistor R2 is grounded EGND1 through the third resistor R3 and the second resistor R2 to form a complete loop, in this case, the voltage across the second resistor R2, i.e. the first voltage V 1 Comprises the following steps:
correspondingly, the output end of the hydrogen production power supply is supposed to be reversely connected with the input end of the water electrolysis hydrogen production tank, the reverse connection judgment is carried out after the hydrogen production system enters the standby state, and at the moment, the detection power supply V is used for detecting the output end of the water electrolysis hydrogen production tank DC Output detection voltage V b The anode output end of the hydrogen production power supply is connected with the cathode input end of the water electrolysis hydrogen production tank, and the cathode input end of the water electrolysis hydrogen production tank is grounded and is equivalent to the first resistor R1 which is grounded through the diode D1. The voltage across the second resistor R2, i.e. the second voltage V, without taking into account the voltage drop of the diode D1 2 Can be expressed as:
therefore, under the condition that the output voltage of the detection power supply is determined, the reverse connection preventing circuit can output two different voltages based on the specific connection condition between the hydrogen production power supply and the water electrolysis hydrogen production tank, and the output reverse connection state can be judged through V1 not equal to V2.
Optionally, when the resistance of the first resistor R1 approaches 0 Ω and the resistance of the second resistor R2 approaches infinity, V1= V b And V2=0, so that the reverse connection judgment process is simplified and the judgment result is more visual.
Furthermore, when the hydrogen production power supply enters an operating state and output voltage exists at the output end, the output voltage of the hydrogen production power supply can be prevented from flowing backwards to the reverse connection prevention circuit based on the unidirectional conduction function of the diode D1, and damage to devices in the reverse connection prevention circuit is avoided.
Optionally, referring to fig. 4, fig. 4 is a block diagram of a hydrogen production power supply provided in an embodiment of the present invention, where the hydrogen production power supply provided in this embodiment includes: the control unit, the power conversion unit, and the anti-reverse connection circuit according to any of the above embodiments of the present invention (shown in fig. 3 by way of example), wherein,
the control unit is respectively connected with the power conversion unit and the reverse connection preventing circuit;
the input end of the power conversion unit is used as the input end of the hydrogen production power supply;
the output end of the power conversion unit is used as the output end of the hydrogen production power supply;
in the embodiment, the control unit collects the output voltage of the reverse-connection preventing circuit and judges whether the water electrolysis hydrogen production tank connected with the output end of the hydrogen production power supply is reversely connected or not according to the output voltage of the reverse-connection preventing circuit.
Optionally, referring to fig. 5, fig. 5 is a block diagram of another hydrogen production power supply provided in an embodiment of the present invention, and on the basis of the embodiment shown in fig. 4, this embodiment provides an optional configuration of a control unit in the hydrogen production power supply, where the control unit specifically includes: a main controller, a voltage sampling circuit and a driving unit, wherein,
the main controller is connected with the control end of the power conversion unit through the driving unit, and the voltage sampling circuit is respectively connected with the main controller and the reverse connection preventing circuit.
The voltage sampling circuit collects the output voltage of the reverse connection preventing circuit and transmits the output voltage to the main controller for reverse connection judgment. Meanwhile, the main controller controls the driving unit, and further controls the operation state of the power conversion unit, so that the power conversion unit can enter the operation state from the standby state and also can enter the fault state from the standby state. The main function of the reverse connection preventing circuit is to judge whether the output has the reverse connection problem or not, and can actively judge before the hydrogen production power supply system operates.
For the power conversion power supply, according to different input power supplies specifically connected with the input ends of the power conversion power supply, corresponding to different circuit topological structures, if the input power supply is a public power grid or a wind power generation system, the power conversion unit is an AC/DC converter, and if the input power supply is a photovoltaic power station, the power conversion unit can be a DC/DC converter.
Optionally, the power conversion unit may further include an isolated power conversion unit or a non-isolated power conversion unit, and meanwhile, may further include a multi-stage power conversion unit or a single-stage power conversion unit.
Optionally, referring to fig. 6, fig. 6 is a block diagram of a water electrolysis hydrogen production system according to an embodiment of the present invention. The system for producing hydrogen by water electrolysis provided by the embodiment comprises: an input power supply, a water electrolysis hydrogen production tank and the hydrogen production power supply provided by any one of the embodiments, wherein,
the input power supply is connected with the input end of the hydrogen production power supply;
the output end of the hydrogen production power supply is connected with the input end of the water electrolysis hydrogen production tank;
the negative input end of the water electrolysis hydrogen production tank is grounded.
Optionally, the input power source comprises one of a public power grid, a photovoltaic power plant and a wind power generation system.
Alternatively, the water electrolysis hydrogen production tank comprises an alkaline water hydrogen production tank or a PEM (proton exchange membrane) electrolysis tank.
In the drawings corresponding to the above embodiments, EGND1 and EGND2 both refer to ground, that is, grounding points, and the impedance between the grounding points is low, and the resistance value is close to 0 Ω.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed in the embodiment corresponds to the method disclosed in the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (15)
1. An anti-reverse connection circuit, comprising: a power supply and a voltage divider circuit are detected, wherein,
the detection power supply is connected with the voltage division circuit;
the voltage division circuit is connected in series between the anode output end of the hydrogen production power supply and the ground;
when the anode output end of the hydrogen production power supply is connected with the anode input end of the water electrolysis hydrogen production tank, the voltage division circuit outputs the output voltage of the detection power supply according to a first voltage division proportion so as to feed back the first voltage;
when the anode output end of the hydrogen production power supply is connected with the cathode input end of the water electrolysis hydrogen production tank, the voltage division circuit outputs the output voltage of the detection power supply according to a second voltage division proportion so as to feed back the second voltage.
2. The reverse-connection prevention circuit according to claim 1, further comprising: a protection circuit, wherein,
the protection circuit is connected in series between the anode output end of the hydrogen production power supply and the voltage division circuit;
the protection circuit is in a disconnected state when the hydrogen production power supply works.
3. The reverse connection prevention circuit according to claim 2, wherein the voltage dividing circuit comprises: a first resistor, a second resistor, and a third resistor, wherein,
one end of the first resistor is connected with the anode output end of the hydrogen production power supply, and the other end of the first resistor is grounded through the second resistor;
one end of the third resistor is connected with the anode of the detection power supply, and the other end of the third resistor is connected with the connection point of the first resistor and the second resistor;
the negative electrode of the detection power supply is grounded;
and two ends of the second resistor are used as output ends of the voltage division circuit to output the first voltage or the second voltage.
4. The anti-reverse connection circuit according to claim 3, wherein the resistance value of the second resistor approaches infinity;
the resistance value of the first resistor approaches zero.
5. The reverse-connection prevention circuit according to claim 2, wherein the protection circuit comprises: controllable switches or unidirectional conducting devices.
6. The anti-reverse connection circuit according to claim 5, wherein the controllable switch comprises any one of a relay, a contactor, and a semiconductor switch tube.
7. The anti-reverse connection circuit of claim 5, wherein the unidirectional conducting device comprises a diode.
8. A hydrogen-producing power supply, comprising: a control unit, a power conversion unit, and the anti-reverse connection circuit of any one of claims 1 to 7,
the control unit is respectively connected with the power conversion unit and the reverse connection preventing circuit;
the input end of the power conversion unit is used as the input end of the hydrogen production power supply;
the output end of the power conversion unit is used as the output end of the hydrogen production power supply;
the control unit is used for judging whether the water electrolysis hydrogen production tank connected with the output end of the hydrogen production power supply is reversely connected or not according to the output voltage of the reverse connection preventing circuit and controlling the working process of the power conversion unit.
9. Hydrogen-producing power supply in accordance with claim 8, characterized in that the control unit comprises: a main controller, a voltage sampling circuit and a driving unit, wherein,
the main controller is connected with the control end of the power conversion unit through the driving unit;
the voltage sampling circuit is respectively connected with the main controller and the reverse connection preventing circuit.
10. Hydrogen-producing power supply in accordance with claim 8, wherein the power conversion unit comprises an AC/DC converter or a DC/DC converter.
11. Hydrogen-producing power supply in accordance with claim 8, wherein the power conversion unit comprises an isolated power conversion unit or a non-isolated power conversion unit.
12. The hydrogen-producing power supply of claim 8, wherein the power conversion unit comprises a multi-stage power conversion unit or a single-stage power conversion unit.
13. A system for producing hydrogen by water electrolysis, comprising: an input power supply, a water electrolysis hydrogen production cell, and a hydrogen production power supply as claimed in any one of claims 8 to 12,
the input power supply is connected with the input end of the hydrogen production power supply;
the output end of the hydrogen production power supply is connected with the input end of the water electrolysis hydrogen production tank;
the negative electrode input end of the water electrolysis hydrogen production tank is grounded.
14. The system for hydrogen production by water electrolysis of claim 13, wherein the input power source comprises one of a utility grid, a photovoltaic power plant, and a wind power generation system.
15. The system for hydrogen production by water electrolysis according to claim 13, wherein the hydrogen production by water electrolysis cell comprises an alkaline water hydrogen production cell or a proton exchange membrane PEM electrolysis cell.
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| CN102055184A (en) * | 2010-12-31 | 2011-05-11 | 广东美的电器股份有限公司 | Direct current power supply reversed connection preventing circuit with polarity distinguishing and control method thereof |
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