CN202068345U - Circuit capable of converting single power supply into positive and negative power supplies - Google Patents

Abstract

The utility model relates to a circuit capable of converting a single power supply into positive and negative power supplies, which comprises an oscillating circuit, two inverting circuits, two pushing circuits and a rectification and filter circuit, wherein the oscillating circuit is used for converting a DC (Direct Current) voltage of the single-phase power supply into a positive and negative pulse voltage, the reverting circuits are connected in the positive and negative pulse voltage converted by the oscillating circuit and output positive and negative pulse voltages, the pushing circuit is connected into pulse voltages with opposite phases output by the reverting circuits and outputs amplified positive and negative pulse voltages, and the rectification and filter circuit is connected into the positive and negative pulse voltage amplified by the pushing circuit and converts the voltage into a stable positive-negative voltage. The circuit has the beneficial effects that as the design of the oscillating circuit is adopted, the influence of the change of a power supply to the oscillating frequency can be reduced, and the dynamic power consumption of circuit working can be reduced; as inverters are connected in parallel, the output current is increased, so that the anti-interference capability of the circuit is strengthened; and the positive half and negative half cycles of an input pulse voltage signal are respectively amplified by three triodes, so as to synthetize a pulse voltage signal which is amplified to two to three hundred times.

Description

Single power conversion positive and negative power supply circuit

technical field

The utility model relates to the field of electricity, in particular to a single power supply conversion positive and negative power supply circuit.

Background technique

Generally, when audio appliances work, they need to provide positive and negative power supplies. At this time, if it is powered by a single power supply, it will inevitably affect audio appliances and other electrical appliances that require positive and negative power supplies. Usually, batteries can only be used for power supply on automobiles, ships, trains and other vehicles, and the batteries only provide DC voltage and cannot be used as positive and negative power supplies, which brings a lot of inconvenience to the use of some instruments that need to work with positive and negative power supplies.

Utility model content

In view of the above problems, the purpose of this utility model is to provide a single power conversion positive and negative power supply circuit capable of converting a single power supply into a positive and negative power supply.

In order to achieve the above purpose, the single power supply conversion positive and negative power supply circuit described in the utility model includes: an oscillating circuit, two inverting circuits, two driving circuits and a rectifying and filtering circuit, wherein,

Oscillating circuit, which converts the DC voltage of a single power supply into positive and negative pulse voltages;

Two inverting circuits, the input end of the first inverting circuit is connected to the pulse voltage output end of the oscillation circuit, and the phase inversion of the pulse voltage is output, and the input end of the second inverting circuit is connected to the first The inverting output terminal of the inverting circuit outputs the phase inverting output of the pulse voltage output in inverting again;

Two push circuits, the first push circuit is connected to the inverting output terminal of the first inverting circuit to amplify the pulse voltage of the first inverting output; the second push circuit is connected to the second inverting circuit the inverting output terminal; amplifying the second inverting pulse voltage;

The rectification and filter circuits are respectively connected to the amplifying terminals of the first driving circuit and the second driving circuit, and convert the amplified positive and negative pulse voltages of the driving circuits into stable positive and negative voltages.

Preferably, the oscillating circuit includes a first resistor, a second resistor, a first capacitor, and two CMOS inverters, wherein one end of the second resistor is connected between the two CMOS inverters through a wire, and the other end is connected through a wire. The wire is connected between the first resistor and the first capacitor, the first resistor is connected with the first CMOS inverter, the first capacitor is connected with the second CMOS inverter and the input terminal of the first inverter circuit.

Both the first inverter circuit and the second inverter circuit are composed of two CMOS inverters connected in parallel.

Both the first push circuit and the second push circuit are composed of two common-collector amplifying circuits.

The beneficial effects of the utility model are:

1. The design of the oscillation circuit reduces the impact of power supply changes on the oscillation frequency, and also reduces the dynamic power consumption of the circuit;

2. The parallel connection of two CMOS inverters is used to increase the output current, so that the anti-interference ability of the circuit itself is enhanced, and the power supply voltage range is maintained at 3-20V;

3. Amplify the positive and negative half cycles of the input pulse voltage signal through two triodes connected in parallel, respectively, and then synthesize the pulse voltage signal amplified two to three hundred times.

Description of drawings

Fig. 1 is a circuit diagram of a single power supply conversion positive and negative power supply circuit described in the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described further.

As shown in Figure 1, a single power supply conversion positive and negative power supply circuit includes an oscillation circuit 1, two inverting circuits, two push circuits, and a rectifier and filter circuit 6; wherein,

Oscillating circuit 1, which converts the DC voltage of a single power supply into positive and negative pulse voltages;

Two inverting circuits, the input end of the first inverting circuit 2 is connected to the pulse voltage output end of the oscillation circuit 1, and the phase inversion of the pulse voltage is output, and the input end of the second inverting circuit 3 is connected to the pulse voltage output end of the oscillation circuit 1. The inverting output terminal of the first inverting circuit 2 is used to output the pulse voltage of the inverting output in phase inversion again;

Two push circuits, the first push circuit 4 is connected to the inverting output terminal of the first inverting circuit 2, and the pulse voltage of the first inverting output is amplified; the second push circuit 5 is connected to the second The inverting output terminal of the inverting circuit 3 amplifies the pulse voltage inverted for the second time;

The rectification and filtering circuit 6 is connected to the amplifying terminals of the first driving circuit 4 and the second driving circuit 5 respectively, and converts the amplified positive and negative pulse voltages of the driving circuits into stable positive and negative voltages.

As a further embodiment of the present invention, the oscillating circuit 1 includes a first resistor 7, a second resistor 8, a first capacitor 9 and two CMOS inverters, wherein one end of the second resistor 8 is connected to two Between two CMOS inverters, the other end is connected between the first resistor 7 and the first capacitor 9 through wires, the first resistor 7 is connected to the first CMOS inverter 10, and the first capacitor 9 is inverting with the second CMOS The device 11 is connected and connected with the input terminal of the first inverter circuit 2.

As a further embodiment of the present utility model, the input end of the first inverting circuit 2 is connected to the output end of the oscillation circuit 1, and the output end of the first inverting circuit 2 is connected to the input end of the second inverting circuit 3. Both the first inverter circuit 2 and the second inverter circuit 3 are composed of two CMOS inverters connected in parallel.

As a further embodiment of the present utility model, the input end of the first push circuit 4 is connected with the output end of the first inverting circuit 2, and the input end of the second push circuit 5 is connected with the output end of the second inverting circuit 3, so Both the first push circuit 4 and the second push circuit 5 are composed of two common-collector amplifier circuits. One of the triodes in the amplifying circuit is preferably a B647 triode 13, and the other is a D667 triode 12.

As a further embodiment of the present invention, the rectification and filtering circuit 6 is a commonly used circuit, and any circuit mode that plays the role of rectification and filtering is suitable for this circuit.

The working principle of the utility model is: in the oscillating circuit, since the voltage at both ends of the first capacitor 9 cannot be mutated when charging, the potential at the two ends of the components in the circuit changes from high to low, repeated changes form oscillations, and the connected The DC voltage of the single power supply is converted into positive and negative pulse voltages. When the positive and negative pulse voltages pass through the first inverting circuit 2, the two CMOS inverters in the first inverting circuit 2 output inverted pulse voltages and increase output current, a part of the pulse voltage output through an inverting phase is directly amplified and output through the first driving circuit 4; The converter outputs an inverted pulse voltage again, and at the same time increases the output current, and the pulse voltage output through the second inverted phase is amplified and output by the second driving circuit 5 .

When the inverting pulse voltage output by the inverting circuit passes through the driving circuit, since each group of triodes is composed of a B647 triode 13 and a D667 triode 12, and the D667 triode 12 amplifies the positive half cycle of the input pulse voltage, the B647 triode 13 Amplify the negative half-cycle of the input pulse voltage, and they are synthesized into a pulse voltage with current amplification (up to two or three hundred times), so the pulse voltage that has been inverted once and the pulse voltage that has been inverted twice will be respectively from the first push circuit 4 , The output of the second push circuit 5 enters the rectification and filtering circuit 6, and the stable positive and negative voltages are achieved and output under the action of rectification and filtering.

The above are only preferred embodiments of the present utility model, but the scope of protection of the present utility model is not limited thereto. Any skilled person familiar with the art within the technical scope disclosed by the utility model can easily think of changes or Replacement should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be determined by the protection scope defined in the claims.

Claims (4)

1. A single power supply conversion positive and negative power supply circuit, characterized in that: it comprises, An oscillating circuit (1), which converts the DC voltage of the single power supply into positive and negative pulse voltages; Two inverting circuits, the input terminal of the first inverting circuit (2) is connected to the pulse voltage output terminal of the oscillation circuit (1), and the phase inversion of the pulse voltage is output, and the second inverting circuit (3) The input terminal of the first inverting circuit (2) is connected to the inverting output terminal of the first inverting circuit (2), and the pulse voltage of the inverting output is phase-inverted again; Two push circuits, the first push circuit (4) is connected to the inverting output terminal of the first inversion circuit (2), and the pulse voltage output by the first inversion (2) is amplified; the second push circuit (5) being connected to the inverting output terminal of the second inverting circuit (3), amplifying the pulse voltage inverted for the second time; The rectification and filtering circuit (6) is respectively connected to the amplifying terminals of the first driving circuit (4) and the second driving circuit (5), and converts the amplified positive and negative pulse voltages of the driving circuits into stable positive and negative voltages. 2. The single power supply conversion positive and negative power supply circuit according to claim 1, characterized in that: the oscillation circuit (1) comprises a first resistor (7), a second resistor (8), a first capacitor (9) and Two CMOS inverters; where, One end of the second resistor (8) is connected between the two CMOS inverters, the other end is connected between the first resistor (7) and the first capacitor (9), the first resistor (7) and the first CMOS inverter The phaser (10) is connected, and the first capacitor (9) is connected with the second CMOS inverter (11) and connected with the input terminal of the first inverter circuit (2). 3. The single power supply conversion positive and negative power supply circuit according to claim 1, characterized in that: the first inverting circuit (2) and the second inverting circuit (3) are all composed of two CMOS inverting circuits connected in parallel Phase configuration. 4. The positive and negative power supply circuit for single power conversion according to claim 1, characterized in that: the first push circuit (4) and the second push circuit (5) are both composed of two common-collector amplifying circuits. the

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