JPH06133542A - Voltage converter - Google Patents

Abstract

PURPOSE:To provide an inexpensive, downsized voltage converter in which conversion efficiency is enhanced greatly by converting DC and AC voltages through a combination of capacitors and switching elements without employing any transformer. CONSTITUTION:An astable multivibrator 1 for converting a DC current into an AC current having an arbitrary frequency and transmitting two signals alternately is connected between DC feeder lines AB. A parallel circuit of two capacitors C1, C2 connected in series and two switching elements, i.e., transistors Tr1, Tr2, connected in series to be turned ON/OFF alternately is also connected between the DC feeder lines AB. Furthermore, a full-wave rectifier circuit 2 is connected respectively, at AC input side contacts (c) and (d) thereof, with the joint X of two capacitors C1, C2 and the joint Y of two transistors Tr1, Tr2 and the astable multivibrator 1 is connected respectively, at the output terminals (a) and (b) thereof, with the transistors Tr1, Tr2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage converter for converting a voltage by combining a capacitor and a switching element.

[0002]

2. Description of the Related Art Conventionally, a transformer having a coil wound around an iron core has been used to convert an AC voltage. This is for converting alternating current, but not for converting direct current. For this reason, in the case of converting the voltage of the direct current, it is necessary to convert the direct current into the alternating current, convert the voltage, and then rectify the direct current to convert it into the direct current. The transformer used for this voltage conversion is expensive because it uses a ferrite core for the iron core, is heavy, is large in size due to winding the coil, and has a very low conversion efficiency of about 85% due to iron loss. Further, there is a similar problem because a transformer is used when converting the voltage of the alternating current.

[0003]

DISCLOSURE OF THE INVENTION The present invention eliminates the above-mentioned drawbacks and converts the voltage of direct current and alternating current by combining a capacitor and a switching element without using a transformer, thereby significantly improving the conversion efficiency. A small and inexpensive voltage converter is provided.

[0004]

According to a first aspect of the present invention, an astable multivibrator for converting DC current into an arbitrary frequency and alternately transmitting two signals is provided between DC power supply lines. , Two capacitors connected in series and two switching elements connected in series that are alternately turned on and off are connected in parallel between the DC power supply lines, and the middle point of the two capacitors and two switching elements are connected. Between the intermediate point of the switching element, the AC input side of the full-wave rectifier circuit or the half-wave rectifier circuit is connected, and the output terminal of the astable multivibrator is connected to the switching element, respectively. Is.

According to a second aspect of the invention, between the DC power supply lines,
An astable multivibrator that converts DC current into an arbitrary frequency and alternately emits two signals is provided, and two switching elements connected in series and alternately turned on and off are connected in parallel between the DC power supply lines. Then, the diagonally arranged switching elements of the switching elements connected in parallel are connected so as to be turned on and off alternately, and the AC input of the voltage doubler rectifier circuit between the intermediate points of the switching elements connected in series. And the output terminals of the astable multivibrator are connected to the switching elements, respectively.

Further, in the invention according to claim 3, a DC power source line is connected to an AC power source through a full-wave rectification circuit, and two capacitors connected in series and two capacitors connected in series and alternately turned on and off. A switching element is connected in parallel between the DC power supply lines, and an intermediate point of two capacitors and 2
The AC input side of the full-wave rectifier circuit is connected between the switching element and the intermediate point of the switching elements, and a circuit for alternately turning on and off the two switching elements is provided between the full-wave rectifier circuit and the switching element. It is characterized by that.

[0007]

According to the first aspect of the present invention, when the input voltage E is applied between the DC power supply lines, one switching element of the astable multivibrator is in the ON state and the other switching element is in the OFF state. The signal is emitted alternately by repeating it alternately. First, a voltage is applied to one switching element to turn it on and a signal is output.
The switching element is turned on by this signal. In this case, the other switching element having no signal output remains in the off state.

In this state, the potential at the intermediate point of the two capacitors becomes a potential corresponding to the capacitance ratio, and the potential at the intermediate point of the two switching elements connected in series is the other switching element in the off state. It is 0 because it exists. Therefore, a potential difference is generated between the two intermediate points, and the DC current flows from the DC power supply line to the load via the capacitor, the full-wave rectification circuit or the half-wave rectification circuit, and the DC current flows.

Next, when the other switching element of the astable multivibrator is turned on, one switching element is turned off. In this state, the potential at the intermediate point of the two capacitors becomes a potential according to the capacitance ratio, and the potential at the intermediate point of the two switching elements connected in series is because one of the switching elements is in the ON state. Therefore, a potential difference is generated between the two intermediate points, and the DC current flows from the DC power supply line to the load via the one switching element, the full-wave rectification circuit or the half-wave rectification circuit, and the DC current flows.

According to the second aspect of the present invention, the input voltage E is applied between the DC power supply lines, and the signal is transmitted alternately and repeatedly by the astable multivibrator. When one signal is applied to one switching element, it is turned on, and the switching elements arranged diagonally are also turned on. In this case, since the other signal is not output, the other switching element remains in the off state. In this state, when the voltage E is applied to the switching element from the DC power supply line, the capacitor of the voltage doubler rectifier circuit is charged. Next, when the other signal is transmitted, the other switching element is turned on and a current flows through the voltage doubler rectifier circuit, where a DC current of 2E flows to the load due to the voltage charged in the capacitor.

According to a third aspect of the present invention, when AC power is applied between the AC power lines, one of the switching elements is turned on and the potential at the intermediate point of the two capacitors is E /.
It becomes 2. Since the potential at the midpoint of the two switching elements connected in series is E, E / 2 is placed between the midpoints.
A potential difference is generated, and a direct current flows at a voltage stepped down to a load via a full-wave rectifying circuit provided therebetween. When a reverse current flows between the AC power lines, the other switching element turns on and the potential at the midpoint of the two capacitors becomes E.
/ 2, and the potential at the midpoint of the two switching elements connected in series is 0, so -E is placed between the midpoints.
A potential difference of / 2 is generated, and a current flows through the full-wave rectification circuit provided between them to the load at a reduced voltage.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to FIG. FIG. 1 shows a step-down circuit for DC current. An astable multivibrator 1 is provided between DC power supply lines AB, and two capacitors C of the same capacity connected in series are connected.
₁ and C ₂ and transistors Tr ₁ and Tr ₂ which are _two switching elements connected in series and turned on and off alternately are connected in parallel between the DC power supply lines AB. The astable multivibrator 1 includes two transistors T _S1 and T _S1 .
Connect _S2 in parallel, connect the plus side of DC power supply line A to the base, and connect one transistor T _S1 to the on state and the other transistor T _S2 to the off state, and then repeat the opposite state. And an oscillator circuit for outputting signals a and b.

Further, a transistor T is provided between the base of the transistor Tr _{1 serving as} the switching element and the DC power supply line B.
r ₃ is connected, the base of which is connected to the signal b of the astable multivibrator 1 via a capacitor C _S2 . The base of the transistor Tr ₂ is connected to the signal a of the astable multivibrator 1 via the capacitor C _S1 .

Two capacitors C connected in series
Assuming that the intermediate point of ₁ and C ₂ is X and the intermediate point of the transistors Tr ₁ and Tr ₂ connected in series is Y, four diodes D ₁ , D ₂ , D ₃ and D ₄ are provided between these XY. Is connected to the AC input side contacts c and d of the full-wave rectification circuit 2 connected to the bridge. Also, the contact e on the DC output side of the full-wave rectifier circuit 2,
f is connected to the load Z.

In the step-down circuit, the DC power supply lines A, B
When the input voltage E (V) is applied in the meantime, one transistor T _S1 of the unstable multivibrator ₁ is in the ON state and the other transistor T _S2 is in the OFF state, and this is repeated alternately, and the signals a and b alternate. Sent. First, a voltage is applied to the base of one of the transistors T _S2 to turn it on, turning off the transistor T _S1 and outputting the signal a. When this signal a is applied to the base of one of the transistors Tr ₂ which is a switching element, it is turned on. In this case, since the signal b is not output, the other transistor Tr ₁ remains off.

In this state, the potential at the midpoint X of the _two capacitors C ₁ and C ₂ having the same capacity is E / 2 (V) which is half the input voltage E (V), and the transistors connected in series. The potential at the intermediate point Y between Tr ₁ and Tr ₂ is the transistor Tr ₁
Is off and the transistor Tr ₂ is on, so 0
(V). Therefore, the potential difference between the intermediate points XY is E / 2.
−0 = E / 2 (V), and the direct current flows from the direct-current power supply line A to the load Z through the capacitor C ₁ , the intermediate point X, the alternating-current input side contact c, the diode D ₁ , and the direct-current output side contact e to E / 2.
A direct current flows at a voltage of (V). At the same time, the discharge from the capacitor C ₂ is also performed in the same path after the intermediate point X, so that it is apparent that the capacitors C ₁ and C _{2 are connected} to E / 2
The voltage of (V) is output. Further, the current flows from the direct current output side contact f to the direct current power source line B through the diode D ₄ , the alternating current input side contact d, the intermediate point Y and the transistor Tr ₂ which is in the on state.

Next, when the other transistor T _S1 of the astable multivibrator 1 is turned on, the transistor T _S1 is turned on.
_S2 is turned off and the signal b is output. When this signal b is applied to the base of the transistor Tr ₃ , it is turned on and a current flows, and a negative voltage is applied to the base of the other transistor Tr ₁ which is a switching element and the transistor Tr ₁ is turned on. Become. In this case, since the signal a is not output, the transistor Tr ₂ is off.

In this state, the potential at the midpoint X of the _two capacitors C ₁ and C ₂ having the same capacity is E / 2 (V) which is half the input voltage E (V), and the transistors connected in series. The potential at the intermediate point Y between Tr ₁ and Tr ₂ is equal to the input voltage E (V). Therefore, the potential difference between the intermediate points XY is E / 2−E = −E
/ 2 (V), and the DC current from the DC power supply line A to the load Z via the transistor Tr ₁ , the intermediate point Y, the AC input side contact d, the diode D ₂ , the DC output side contact, and e is E / 2 (V)
DC current flows at the voltage. At the same time, the discharge from the capacitor C ₁ is also performed on the same path after the intermediate point Y. Further, the current flows from the direct current output side contact point f to the direct current power source line B through the diode D ₃ , the alternating current input side contact point C, the intermediate point X and the condenser C ₂ . The transistors T _S1 and T _S2
A transistor Tr _1, Tr _2, capacitors C _S1, C _S2 and signals a, a waveform diagram of a current i _a, i _b and b are as shown in FIG.

FIG. 3 shows capacitors C ₁ and C having different capacities.
Figure 3 shows another embodiment of the invention in which ₂ is used to convert to two different voltages. An astable multivibrator 1 is provided between the DC power supply lines AB, and further connected in series 2
Capacitors C ₁ and C ₂ having different capacities and transistors Tr ₁ and Tr _{2 serving as two} switching elements which are connected in series and alternately turn on and off are connected in parallel between the DC power supply lines AB.

Between the base of the transistor Tr _{1 serving as} the switching element and the DC power supply line B, the transistor T
r ₃ is connected, the base of which is connected to the signal b of the astable multivibrator 1 via a capacitor C _S2 . The base of the transistor Tr ₂ is connected to the signal a of the astable multivibrator 1 via the capacitor C _S1 .

Two capacitors C connected in series
A diode D ₁ and a capacitor C ₃ which are connected in series are connected in parallel between an intermediate point X of ₁ and C ₂ and an intermediate point Y of the transistors Tr ₁ and Tr _{2 which} are connected in series. , A half-wave rectifying circuit 3 in which a diode D ₂ and a capacitor C ₄ connected in series are connected in parallel.

In the above step-down circuit, DC power supply lines A, B
An input voltage E (V) is applied between them, and the astable multivibrator 1 alternately and repeatedly transmits signals a and b. If the capacitance ratio of the _two capacitors C ₁ and C ₂ is 3: 1, 1 / 4E (V) is divided into the capacitor C ₁ and 3 / 4E (V) is divided into the capacitor C ₂ , so the capacitor C The potential at the intermediate point X between ₁ and C ₂ is 3 / 4E (V). When the transistor Tr ₂ is turned on by the signal a, the transistor Tr ₁ is turned off, so that the transistors Tr ₁ and T ₂ are turned on.
The potential at the midpoint Y of r ₂ is 0 (V). Therefore, the potential difference between the intermediate points XY becomes 3 / 4E-0 = 3 / 4E (V), the capacitor C ₄ is charged with 3 / 4E (V), and the load Z is connected to the load Z from the contacts e and f on the DC output side. / 4E (V) can be taken out.

When the signal b is output and applied to the base of the transistor Tr ₃ , it is turned on and a current flows, and a negative voltage is applied to the base of the other transistor Tr ₁ which serves as a switching element and the transistor Tr ₁ is applied. Tr ₁
Turns on. In this case, since the signal a is not output, the transistor Tr ₂ remains off. When the transistor Tr ₂ is turned on, the potential at the intermediate point Y between the transistors Tr ₁ and Tr ₂ becomes E (V). Therefore, the potential difference between the intermediate points X and Y becomes 3 / 4E-E = 1 / 4E (V), the capacitor C ₃ is charged with 1 / 4E (V), and the DC output side contacts g and h are connected to the load Z by 1 A voltage of / 4E (V) can be taken out.

FIG. 4 shows another embodiment of the present invention showing a booster circuit, in which an astable multivibrator 1 is provided between DC power supply lines AB, and two switching devices connected in series and alternately turned on and off are provided. Transistor T that becomes an element
Two sets of r ₁ and Tr ₃ and two sets of transistors Tr ₂ and Tr ₄ that are connected in series and that are alternately turned on and off and serve as switching elements are connected in parallel between the DC power supply lines AB. The base of the transistor Tr ₁ is connected to the signal a of the astable multivibrator 1 via a capacitor C _S1 ,
Furthermore, the transistor Tr ₂ is connected to the signal b of the astable multivibrator 1 via the capacitor C _S2 .

The base of the transistor Tr ₃ connected in series with the transistor Tr ₁ is connected to the lines of the transistors Tr ₂ and Tr ₄ connected in parallel with it, and the base of the transistor Tr ₄ is connected in parallel with this. Are connected to the lines of the transistors Tr ₁ and Tr ₃ connected to each other, and these transistors Tr ₁ , Tr ₂ , Tr ₃ , Tr ₄ are alternately turned on and off diagonally.

Further, transistors Tr ₁ connected in series,
Let X be the middle point of Tr ₃ and Y be the middle points of the transistors Tr ₂ and Tr ₄ connected in series. Between these XY, two diodes D ₁ and D ₂ and capacitors C ₁ and C ₂ are connected. It is connected to the AC input side contacts c and d of the voltage doubler rectifier circuit 4 connected to the bridge. The DC output side contacts e and f of the voltage doubler rectifier circuit 4 are connected to the load Z.

In the booster circuit, the DC power supply lines A, B
An input voltage E (V) is applied between them, and the astable multivibrator 1 alternately and repeatedly transmits signals a and b. When the signal a is applied to the base of _one of the transistors Tr ₁ which is a switching element, it is turned on,
The transistor Tr ₄ arranged diagonally also turns on. In this case, since the signal b is not output, the transistors Tr ₂ and Tr _{3 are}
Remains off. In this state, the current of the voltage E from the DC power supply line A flows through the transistor Tr ₄ and the intermediate point Y,
The potential of the intermediate point Y is E (V), and the intermediate point X connected to the minus side is 0 (V), so the potential difference between the intermediate points XY is 0-E = -E (V). Becomes

Next, when the signal b is transmitted, the transistor T
It is applied to the base of r ₂ to turn it on, and the transistor Tr ₃ arranged diagonally also turns on. in this case,
Since the signal a is not output, the transistors Tr ₁ and Tr ₄ remain off. In this state, a direct current flows from the transistor Tr ₃ through the intermediate point X, and the potential at the intermediate point X is E
(V), and the midpoint Y connected to the negative side is 0
(V), the potential difference between the intermediate points X and Y is E-0 = E
(V). Therefore, an AC voltage of E (V) is generated between the intermediate points X and Y, and this is doubled by the voltage doubler rectifier circuit 4 in which _two diodes D ₁ and D ₂ and capacitors C ₁ and C ₂ are connected to the bridge. DC output side contact e by rectifying,
A direct current of 2E (V) flows from f to the load Z.

FIG. 5 shows another embodiment of the present invention showing a step-down circuit for AC current which has the same function as a transformer, and four diodes D ₅ and D ₅ are provided between AC power supply lines FG.
A full-wave rectifier circuit 5 in which ₆ , D ₇ , and D ₈ are connected to a bridge is provided and connected to the DC power supply lines A ₁ B ₁ . Further, two transistors Tr ₁ and Tr ₂ which are connected in series and serve as switching elements which are alternately turned on and off, and two capacitors C ₁ and C ₂ having the same capacity connected in series are connected to the DC power supply line A ₁ B ₁ It is connected in parallel between.

2 connected in series with the full-wave rectifier circuit 5
If an intermediate point between the transistors Tr ₁ and Tr ₂ is S ₁ , a resistor, a Zener diode ZD ₁ and a diode D are connected in series between the DC power supply line A ₁ and this intermediate point S _1. Further, a diode D, a resistor and a Zener diode ZD ₂ are connected in series between the intermediate point S ₁ and the DC power supply line B ₁ . This Zener diode ZD ₁ , Z
Each D ₂ is set to be energized when a voltage exceeding E / 2 of the DC voltage E is applied.

Two capacitors C connected in series
_If the midpoint between ₁ and C ₂ is X _1, and the midpoint between the transistors Tr ₁ and Tr ₂ connected in series is Y ₁ , then this X ₁ Y
Four diodes D ₁ between _1, D _2, D _3, D ₄ AC input contact c of the full-wave rectifier circuit 2 connected to the bridge,
d is connected. The configuration up to this point is the first step-down circuit 6 that steps down the voltage in half.

The second step-down circuit 7 has the same structure as the first step-down circuit 6, and the full-wave rectifier circuit 2 has a DC power supply line A ₂
B ₂ is connected. Two transistors Tr ₃ , which are connected in series and serve as switching elements which are alternately turned on and off,
Tr ₄ and two capacitors C of the same capacity connected in series
₃ and C ₄ are connected in parallel between the DC power supply lines A _{2 and} B ₂ .

Letting S ₂ be an intermediate point between the two transistors Tr ₃ and Tr ₄ connected in series, a resistor and a Zener diode ZD are provided between the DC power supply line A ₂ and this intermediate point S _{2. 3} and the diode D are connected in series, and further, the diode D, the resistor and the Zener diode ZD ₄ are connected in series between the intermediate point S ₂ and the DC power supply line B ₂ .
These Zener diodes ZD ₃ and ZD ₄ are E / 4 (V)
Each of them is set to be energized when a voltage exceeding the above is applied.

Further the midpoint of the two capacitors C _3, C ₄ connected in series between the DC power supply line A ₂ B ₂ and X _2,
The intermediate point of the transistors Tr ₃ and Tr ₄ connected in series is Y
_{If it is 2} , four diodes D are placed between this X ₂ Y _2
1 , D ₂ , D ₃ , and D ₄ are connected to AC input side contacts g and h of the full-wave rectifier circuit 2 in which a bridge is connected.

When an AC power source is applied between the AC power source lines FG in the step-down circuit, a current _first flows from the diode D ₅ of the full-wave rectifier circuit ₅ to the DC power source line A ₁ , and a resistor and a Zener diode ZD connected in series are connected. ₁ and the diode D, flows through the intermediate point S ₁ to the AC power supply line G, and the transistor Tr ₁ is turned on. In this case, DC power supply line A ₁ B ₁
Assuming that the voltage between them is E (V), no current flows through the Zener diodes ZD ₁ and ZD ₂ connected in series unless a voltage exceeding E (V) is applied in total, and the current is one Zener diode ZD ₁ Flows through the intermediate point S ₁ to the AC power supply line G, and does not flow to the other Zener diode ZD ₂ .

When the transistor Tr ₁ is turned on, a current flows and the potential at the intermediate point Y ₁ becomes E (V). Further, since the capacitors C ₁ and C ₂ having the same capacity are connected in series, the potential at the intermediate point X ₁ becomes half of E / 2 (V). As a result,
The potential difference between the intermediate points Y _{1 and} X ₁ is EE / 2 = E / 2
(V), and from the DC output side contact e to the second step-down circuit 7
Flowing through the DC power supply line A ₂ . Further, the current flows through the resistor, the Zener diode ZD ₃ and the diode D connected in series, from the intermediate point S ₂ to the intermediate point X ₁ of the first step-down circuit 6, and then to the capacitor C ₁ . Also in this case, the Zener diodes ZD ₃ and ZD ₄ connected in series have a total of E /
If a voltage exceeding 2 (V) is not applied, no current will flow,
The current flows from one Zener diode ZD ₃ to the midpoint S ₂
Through to the intermediate point X _{1 and not} to the other Zener diode ZD ₄ .

As a result, the transistor Tr ₃ is turned on and a current flows, and the potential at the intermediate point Y ₂ becomes E / 2 (V) which is the same as that between the DC power supply lines A _{2 and} B ₂ . Also a condenser C of the same capacity
_{Since 3} and C ₄ are connected in series, the potential at the intermediate point X ₂ becomes E / 4 (V). As a result, the potential difference between the intermediate points Y ₂ -X ₂ becomes E / 2−E / 4 = E / 4 (V), current flows from the direct current output side contact i to the load Z, and the full wave rectification circuit 2 It flows through the diode D ₄ and the intermediate point X ₂ to the negative side of the capacitor C ₃ .

When a reverse current flows between the AC power supply line FG, first, the current flows from the AC power supply line G through the intermediate point S ₁ in series with the resistance, the Zener diode ZD ₂ and the diode D to the DC power supply. It flows to the line B ₁ , further passes through the diode D ₇ of the full-wave rectifier circuit 5, and passes through the transistor Tr ₂
Turns on. In this case, the transistor Tr ₁ does not flow into the Zener diode ZD ₁ and is turned off.

When the transistor Tr ₂ is turned on, the intermediate point Y ₁
Potential is 0 (V) and the midpoint X ₁ is E / 2 (V), the potential difference between the midpoints Y _{1 and} X ₁ is 0-E / 2 =
-E / 2 (V), and the current from the capacitor C ₂ is the midpoint X ₁ , the midpoint S _{2 of} the second step-down circuit 7, the Zener diode ZD ₄ , the DC power supply line B ₂ , and the first step-down circuit 6. It flows through the diode D ₃ , the intermediate point Y ₁ , and the transistor Tr ₂ to the negative side of the capacitor C ₂ .

As a result, the transistor Tr _{4 of} the second step-down circuit 7 is turned on and the potential at _the intermediate point Y ₂ becomes 0 (V).
Further, since the capacitors C ₃ and C ₄ having the same capacitance are connected in series, the potential at the intermediate point X ₂ becomes E / 4 (V). As a result, the potential difference between the intermediate points Y _{2 and} X ₂ is 0-E / 4 =-
E / 4 (V), from the condenser C ₄ to the midpoint X
_2, the diode D ₂ of the full-wave rectifying circuit 2, a DC output side contact i load Z to the E / 4 (V) to flow through, yet a full-wave rectifier circuit 2 of the diode D _3, the midpoint Y _2, transistor Tr ₄
Through the negative side of the condenser C ₄ .

In the above embodiment, the structure in which the first step-down circuit 6 and the second step-down circuit 7 are combined is shown. However, only the first step-down circuit 6 steps down the voltage to E / 2 (V). A structure may be used, or a structure in which three or more step-down circuits are combined to reduce the voltage may be used. Further, in the above embodiment, the case where the transistor is used as the switching element is shown, but the structure using the electronic relay may be used.

[0042]

As described above, according to the voltage converter of the present invention, the DC and AC voltages are converted by combining the capacitor and the switching element without using a transformer, and the conversion efficiency is 95% or more. In addition to being able to greatly improve the manufacturing cost, the device can be downsized and manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a voltage conversion device for stepping down a voltage according to an embodiment of the present invention.

FIG. 2 is a waveform diagram of the voltage conversion device shown in FIG.

FIG. 3 is a circuit diagram showing a voltage conversion device when stepping down to two different voltages according to another embodiment of the present invention.

FIG. 4 is a circuit diagram showing a voltage conversion device for boosting according to another embodiment of the present invention.

FIG. 5 is a circuit diagram showing a voltage converter for directly stepping down an alternating current according to another embodiment of the present invention.

[Explanation of sign]

 1 astable multivibrator 2 full-wave rectifier circuit 3 half-wave rectifier circuit 4 double voltage rectifier circuit 5 full-wave rectifier circuit 6 first step-down circuit 7 second step-down circuit

Claims (3)

[Claims] 1. A non-stable multivibrator which converts a direct current into an arbitrary frequency and alternately emits two signals is provided between direct current power supply lines, and is connected in series with two capacitors connected in series. Two switching elements that are alternately turned on and off are connected in parallel between the DC power supply lines,
An AC input side of a full-wave rectifier circuit or a half-wave rectifier circuit is connected between an intermediate point of the two capacitors and an intermediate point of the two switching elements, and an output terminal of the unstable multivibrator is connected to the output terminal of the astable multivibrator. A voltage conversion device characterized in that each is connected to a switching element. 2. A non-stable multivibrator that converts a direct current into an arbitrary frequency and alternately emits two signals is provided between direct current power supply lines, and two switching elements connected in series and alternately turned on and off are provided. Two sets of the switching elements connected in parallel are connected between the DC power supply lines, and switching elements arranged in a diagonal pattern of the switching elements connected in parallel are connected so as to be alternately turned on and off, and the middle of each of the switching elements connected in series. A voltage conversion device characterized in that an AC input side of a voltage doubler rectifier circuit is connected between the points, and an output terminal of the unstable multivibrator is connected to each of the switching elements. 3. Two capacitors, which are connected in series to an AC power source via a full-wave rectifier circuit and are connected in series,
Two switching elements connected in series and alternately turned on and off are connected in parallel between the DC power supply lines, and between the midpoints of the two capacitors and the midpoints of the two switching elements. A voltage conversion device, wherein a circuit for connecting an AC input side of a wave rectifier circuit and for alternately turning on and off the two switching elements is provided between the full wave rectifier circuit and the switching elements.