Circuit for preventing direct current equipment from distinguishing positive electrode and negative electrode

Abstract

The utility model discloses a circuit enabling direct current equipment not to distinguish positive and negative electrodes. The circuit comprises a positive and negative electrode polarity adjusting circuit and a boost compensation circuit. The positive and negative polarity adjusting circuit ensures that the circuit behind the node 1 and the node 2 obtains correct current polarity in any connection, and comprises a germanium diode D1, a germanium diode D2, a germanium diode D3 and a germanium diode D4, and when the upper access line is positive and the lower access line is negative or the upper access line is negative and the lower access line is positive, the positive and negative polarity adjusting circuit can adjust the current polarity of the circuit behind the node 1 and the node 2. The current can pass through several germanium diodes to ensure that the correct current polarity is input into the subsequent circuit; the boost compensation circuit not only can compensate the voltage consumed by the diode and ensure that the circuit behind the node 1 and the node 2 obtains the standard voltage, but also can stabilize the voltage fluctuation, and can prolong the normal working time of the circuit when the AC power supply is powered by the battery and the voltage of the battery is reduced along with discharging when the AC power supply is powered by the battery.

Description

Technical Field

[0001] The utility model specifically relates to the technical field of circuits, and in particular to a circuit that allows a DC device to not distinguish between positive and negative poles and a boost circuit that compensates for a previously consumed voltage. Background Art

[0002] DC power distribution equipment is an intermediate device between the rectifier, battery and DC load in the DC power supply system. It has the functions of circuit conversion, protection, control, measurement and issuing alarm signals.

[0003] In the past, the DC devices or single DC boards we used had to connect the positive pole of the power supply to the positive pole and the negative pole to the negative pole in order to work. They had to be carefully checked before wiring. Otherwise, if the positive and negative poles were connected incorrectly, the device would not work or the circuit would be burned out, causing unnecessary losses. Therefore, it is urgent to change this situation so that DC devices do not need to distinguish between positive and negative poles. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a circuit that allows DC equipment to not distinguish between positive and negative poles. At the same time, when the equipment is powered by a battery alone, the normal working time of the circuit can be extended by boosting the voltage as the battery voltage decreases with discharge.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] Circuits that allow DC devices to not distinguish between positive and negative poles, including positive and negative polarity adjustment circuits and boost compensation circuits;

[0007] The positive and negative polarity adjustment circuit (this circuit has the same function as a rectifier bridge stack, but the rectifier bridge stack consumes too much voltage and the voltage drop is too large to ensure the normal operation of the subsequent circuit) includes a germanium diode D1, a germanium diode D2, a germanium diode D3 and a germanium diode D4. When the upper access line is positive and the lower one is negative, the current cannot pass through the germanium diode D3, but can only flow into the node 1 through the germanium diode D1, and then flow out from the negative pole of the circuit behind the node. At this time, the negative current can only pass through the germanium diode D4 to the negative access line of the power supply; when the upper access line is negative and the lower one is positive, the current cannot pass through the germanium diode D4, but can only flow into the positive pole of the electrical equipment through the germanium diode D2, then flow out from the negative pole of the equipment, and then pass through the germanium diode D3 to the upper negative access line.

[0008] Furthermore, the boost compensation circuit includes an inductor, a PW5100 boost chip, capacitors C1 and C2. After the current passes through the inductor, it cooperates with the internal circuit of the PW5100 boost chip to form a chopper boost circuit.

[0009] Furthermore, the capacity of the inductor is 6.8uh.

[0010] Furthermore, the capacity of the capacitor C1 is 10UF, and the capacity of the capacitor C2 is 22UF.

[0011] Furthermore, the germanium diode D1, the germanium diode D2, the germanium diode D3 and the germanium diode D4 consume a voltage of 0.2V (the germanium diode consumes a lower voltage than the silicon diode and the rectifier bridge itself).

[0012] Furthermore, the PW5100 boost chip cooperates with the inductor to realize internal 1.2M PFM synchronous boost conversion, and the input voltage as low as 0.7V can stabilize the output above 3.0V.

[0013] The beneficial effects of the utility model are:

[0014] D1, D2, D3, and D4 before nodes 1 and 2 can adjust the positive and negative poles to input to the subsequent circuit after the power supply is reversed. The circuit after nodes 1 and 2 can compensate for the voltage consumed by the previous four diodes, so that the two connected wires do not need to distinguish between the positive and negative polarities. Any connection method can ensure that the circuit after nodes 1 and 2 obtains the correct current polarity; it can not only compensate for the voltage consumed by the diode, but also stabilize voltage fluctuations. When the AC power supply is cut off and the battery is used for power supply, the normal working time of the circuit can be extended when the battery voltage decreases as it discharges. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a circuit connection diagram of a circuit that allows DC equipment to not distinguish between positive and negative poles, as proposed by the utility model;

[0016] Figure 2 The utility model provides a circuit structure diagram of a circuit that allows DC equipment to avoid distinguishing between positive and negative poles. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. It should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "setting" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0018] Reference Figure 1-2 , so that DC equipment does not need to distinguish between positive and negative poles, including positive and negative polarity adjustment circuits and boost compensation circuits;

[0019] The positive and negative polarity adjustment circuit includes a germanium diode D1, a germanium diode D2, a germanium diode D3 and a germanium diode D4. When the upper access line is positive and the lower one is negative, the current cannot pass through the germanium diode D3, but can only flow into node 1 through the germanium diode D1, and then flow out from the negative pole of the circuit behind the node. At this time, the negative current can only pass through the germanium diode D4 to the negative access line of the power supply; when the upper access line is negative and the lower one is positive, the current cannot pass through the germanium diode D4, but can only flow into the positive pole of the electrical equipment through the germanium diode D2, and then flow out from the negative pole of the equipment, and then pass through the germanium diode D3 to the upper negative access line.

[0020] D1, D2, D3, and D4 before nodes 1 and 2 can adjust the positive and negative polarities to input to the subsequent circuit even after the power supply is connected in reverse. The circuit after nodes 1 and 2 compensates for the voltage consumed by the first four diodes, so that the two connected wires do not need to distinguish between the positive and negative polarities. Any connection method ensures that the circuit after nodes 1 and 2 obtains the correct current polarity.

[0021] The function of the boost compensation circuit is to consume the voltage drop of the diode itself. In order to ensure that the circuit can work normally under low voltage conditions, a boost compensation circuit must be added. It includes an inductor, a PW5100 boost chip, capacitor C1 and capacitor C2. After the current passes through the inductor, it cooperates with the internal circuit of the PW5100 boost chip to form a chopper boost circuit; the capacity of the inductor is 6.8uh; the capacity of capacitor C1 is 10UF, and the capacity of capacitor C2 is 22UF.

[0022] The PW5100 boost chip cooperates with the inductor to realize the internal 1.2M PFM synchronous boost conversion. The minimum input voltage of 0.7V can make the output stable above 3.0V. It can not only compensate the voltage consumed on the diode, but also stabilize the voltage fluctuation. When the AC power is cut off and powered by the battery, the battery voltage decreases as the discharge time increases. At this time, the boost compensation circuit can also increase the voltage, so that the circuit can work normally and extend the normal working time of the circuit.

[0023] The germanium diode D1, germanium diode D2, germanium diode D3 and germanium diode D4 consume a voltage of 0.2V. This part has a similar function to the rectifier bridge stack, but the rectifier bridge stack consumes 1.4V voltage, which affects the working stability of the subsequent circuit. Therefore, a single germanium diode with a consumption voltage of only 0.2V is used.

[0024] Working principle of this embodiment: when in use, when the upper access line is positive and the lower one is negative, the current cannot pass through the germanium diode D3, and can only flow into node 1 through the germanium diode D1, and then flow out from the negative pole of the circuit behind the node. At this time, the negative current can only pass through the germanium diode D4 to the negative access line of the power supply; when the upper access line is negative and the lower one is positive, the current cannot pass through the germanium diode D4, and can only flow into the positive pole of the electrical equipment through the germanium diode D2, and then flow out from the negative pole of the equipment, and then pass through the germanium diode D3 to the upper negative access line, so that the two access lines do not need to distinguish between the positive and negative polarities, and any connection method ensures that the circuits behind nodes 1 and 2 obtain the correct current polarity.

[0025] The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, according to the technical scheme and utility model concept of the utility model, shall be covered by the protection scope of the utility model (for example, when used in a 12V system, a 12V boost chip is used to obtain a positive and negative polarity adjustment circuit).

Claims

1. A circuit that allows DC devices to not distinguish between positive and negative poles, characterized in that: It includes a positive and negative polarity adjustment circuit and a boost compensation circuit; The positive and negative polarity adjustment circuit includes a germanium diode D1, a germanium diode D2, a germanium diode D3 and a germanium diode D4. When the upper access line is positive and the lower access line is negative, the current cannot pass through the germanium diode D3, but can only flow into the node 1 through the germanium diode D1, and then flow out from the negative pole of the circuit behind the node. At this time, the negative current can only pass through the germanium diode D4 to the negative access line of the power supply; when the upper access line is negative and the lower access line is positive, the current cannot pass through the germanium diode D4, but can only flow into the positive pole of the electrical equipment through the germanium diode D2, and then flow out from the negative pole of the equipment, and then pass through the germanium diode D3 to the upper negative access line.

2. The circuit for making DC equipment not distinguish between positive and negative poles as claimed in claim 1, characterized in that: The boost compensation circuit includes an inductor, a PW5100 boost chip, capacitors C1 and C2. After the current passes through the inductor, it cooperates with the internal circuit of the PW5100 boost chip to form a chopper boost circuit.

3. The circuit for making DC equipment not distinguish between positive and negative poles as claimed in claim 2, characterized in that: The capacity of the inductor is 6.8uh.

4. The circuit for making DC equipment not distinguish between positive and negative poles as claimed in claim 3, characterized in that: The capacity of the capacitor C1 is 10UF, and the capacity of the capacitor C2 is 22UF.

5. The circuit for making DC equipment not distinguish between positive and negative poles as claimed in claim 1, characterized in that: The germanium diode D1 , the germanium diode D2 , the germanium diode D3 and the germanium diode D4 consume a voltage of 0.2V.

6. The circuit for allowing a DC device to not distinguish between positive and negative poles as claimed in any one of claims 2 to 4, characterized in that: The PW5100 boost chip cooperates with the inductor to realize the internal 1.2M PFM synchronous boost conversion. The minimum input voltage of 0.7V can make the output stable above 3.0V.

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